Revert S3 client initialization added in conda#10516 (conda#10759)

* Revert "Don't create unused s3 client at import time (conda#10516)" [commit 1456484]
* Update changelog

Fix conda#10756.

* Add `--dry-run` option to `conda env create` (conda#10635)

* Print warning about pip-installed dependencies only once (conda#10638)
* Explicit install now respects `--download-only` flag (conda#10688)
* Bump vendored tqdm version (conda#10721)

* Fix `changeps1` handling for PowerShell (conda#10624)
* Handle unbound `$PS1` so sh activation does not fail with `set -u` (conda#10701)
* Fix sh activation so `$PATH` is properly restored on errors (conda#10631)
* Fix `-c` option handling so defaults channel is not always re-added (conda#10735)
* Fix artifact verification-related warnings and errors (conda#10627, conda#10677)
* Fix log level used in `conda/core/prefix_data.py` (conda#9998)
* Fix log level used when fetching artifact verification metadata (conda#10621)
* Don't create an unused S3 client at import time (conda#10516)
* Don't load `binstar_client` until needed (conda#10692)
* Reflect dropping of older Python versions in `setup.py` (conda#10642)

* Merge release notes and changelog to reduce maintenance burden (conda#10745)
* Add mentions to PyPy, Anaconda terms of service (conda#10329, conda#10712)
* Update Python versions in examples (conda#10329, conda#10744)
* Update install macOS instructions (conda#10728)

* @AlbertDeFusco
* @awwad
* @casperdcl
* @cgranade
* @chenghlee
* @ColemanTom
* @dan-hook
* @dbast
* @ericpre
* @HedgehogCode
* @jamesp
* @jezdez
* @johnhany97
* @lightmare
* @mattip
* @maxerbubba
* @mrakitin
* @stinos
* @thermokarst

Release conda 4.10.1

Bug fixes:
* Fix version detection for `__linux` virtual package (conda#10599)
* Fix import from `conda_content_trust` (conda#10589)
* Fix how URL for verification metadata files are constructed (conda#10617)
* Partially fix profile `$PATH` setup on MSYS2 (conda#10459)
* Remove `.empty` directory even when `rsync` is not installed (conda#10331)

Contributors:
* @awwad
* @chenghlee
* @codepage949
* @niklasholm

Release conda 4.10.0

NOTE: This release formally drops support for Python 2.7 and Python < 3.6.

Enhancements:
* Add pilot support for metadata signatures and verification (conda#10578)
* Add `__linux` virtual package (conda#10552, conda#10561)
* Support nested keys when using `conda config --get` (conda#10447, conda#10572)
* Support installing default packages when using `conda env create` (conda#10530)
* Support HTTP sources for `conda env update -f` (conda#10536)
* Make macOS code signing operations less verbose (conda#10372)

Bug fixes:
* Fix `conda search` crashing on Python 3.9 (conda#10542)
* Allow `{channel}::pip` to satisfy pip requirements (conda#10550)
* Support `{host}:{port}` specifications in environment YAML files (conda#10417)
* Fall back to system `.condarc` if user `.condarc` is absent (conda#10479)
* Try UTF-16 if UTF-8 fails when reading environment YAML files (conda#10356)
* Properly parse Python version >= 3.10 (conda#10478)
* Fix zsh initialization when `$ZDOTDIR` is defined (conda#10413)
* Fix path handling for csh (conda#10410)
* Fix `setup.py` requirement for vendored `ruamel_yaml_conda` (conda#10441)
* Fix errors when pickling vendored `auxlib` objects (conda#10386)

Docs:
* Document the `__unix` and `__windows` virtual packages (conda#10511)
* Update list of supported and default versions of Python (conda#10531)
* Favor using `pip` instead of `setup.py` when setting up CI (conda#10308)

Contributors:
* @awwad
* @BastianZim
* @beenje
* @bgobbi
* @blubs
* @chenghlee
* @cjmartian
* @ericpre
* @erykoff
* @felker
* @giladmaya
* @jamesmyatt
* @mingwandroid
* @opoplawski
* @saadparwaiz1
* @saucoide

4.9.2 changelog

Merge pull request conda#10316 from chenghlee/changelog-4.9.1

4.9.1 changelog

4.9.0 (2020-10-19)

Enhancements:
* Add `osx-arm64` as a recognized platform (conda#10128, conda#10134, conda#10137)
* Resign files modified during installation on ARM64 macOS (conda#10260)
* Add `__archspec` virtual package to identify CPU microarchitecture (conda#9930)
* Add `__unix` and `__win` virtual packages (conda#10214)
* Add `--no-capture--output` option to `conda run` (conda#9646)
* Add `--live-stream` option to `conda run` (conda#10270)
* Export and import environment variables set using `conda env config` (conda#10169)
* Cache repodata from `file://` channels (conda#9730)
* Do not relink already-installed packages (conda#10208)
* Speed up JSON formatting in logz module (conda#10189)

Bug fixes:
* Stop `env remove --dry-run` from actually removing environments (conda#10261)
* Virtual package requirements are now considered by the solver (conda#10057)
* Fix cached filename processing when using only tar.bz2 (conda#10193)
* Stop showing solver hints about CUDA when it is not a dependency (conda#10275)
* Ignore virtual packages when checking environment consistency (conda#10196)
* Fix `config --json` output errors in certain circumstances (conda#10194)
* More consistent error handling by `conda shell` (conda#10238)
* Bump vendored version of tqdm to fix various threading and I/O bugs (conda#10266)

Docs:
* Correctly state default `/AddToPath` option in Windows installer (conda#10179)
* Fix typos in `--repodata-fn` help text (conda#10279)

Miscellaneous:
* Update CI infrastructure to use GitHub Actions (conda#10176, conda#10186, conda#10234)
* Update README badge to show GitHub Actions status (conda#10254)

Contributors
* @AlbertDeFusco
* @angloyna
* @bbodenmiller
* @casperdcl
* @chenghlee
* @chrisburr
* @cjmartian
* @dhirschfeld
* @ericpre
* @gabrielcnr
* @InfiniteChai
* @isuruf
* @jjhelmus
* @LorcanHamill
* @maresb
* @mingwandroid
* @mlline00
* @xhochy
* @ydmytryk

4.8.5 changelog

4.8.4 (2020-08-06)

Enhancements:

* Add `linux-ppc64` as a recognized platform (conda#9797, conda#9877)
* Add `linux-s390x` as a recognized platform (conda#9933, conda#10051)
* Add spinner to pip installer (conda#10032)
* Add support for running conda in PyPy (conda#9764)
* Support creating conda environments using remote specification files (conda#9835)
* Allow request retries on various HTTP errors (conda#9919)
* Add `compare` command for environments against a specification file (conda#10022)
* Add (preliminary) support for JSON-format activation (conda#8727)
* Properly handle the `CURL_CA_BUNDLE` environment variable (conda#10078)
* More uniformly handle `$CONDA_PREFIX` when exporting environments (conda#10092)
* Enable trailing `_` to anchor OpenSSL-like versions (conda#9859)
* Replace `listdir` and `glob` with `scandir` (conda#9889)
* Ignore virtual packages when searching for constrained packages (conda#10117)
* Add virtual packages to be considered in the solver (conda#10057)

Bug fixes:

* Prevent `remove --all` from deleting non-environment directories (conda#10086)
* Prevent `create --dry-run --yes` from deleting existing environments (conda#10090)
* Remove extra newline from environment export file (conda#9649)
* Print help on incomplete `conda env config` command rather than crashing (conda#9660)
* Correctly set exit code/errorlevel when `conda run` exits (conda#9665)
* Send "inconsistent environment" warnings to stderr to avoid breaking JSON output (conda#9738)
* Fix output formatting from post-link scripts (conda#9841)
* Fix URL parsing for channel subdirs (conda#9844)
* Fix `conda env export -f` sometimes producing empty output files (conda#9909)
* Fix handling of Python releases with two-digit minor versions (conda#9999)
* Do not use gid to determine if user is an admin on \*nix platforms (conda#10002)
* Suppress spurious xonsh activation warnings (conda#10005)
* Fix crash when running `conda update --all` on a nonexistent environment (conda#10028)
* Fix collections import for Python 3.8 (conda#10093)
* Fix regex-related deprecation warnings (conda#10093, conda#10096)
* Fix logic error when running under Python 2.7 on 64-bit platforms (conda#10108)
* Fix Python 3.8 leaked semaphore issue (conda#10115)

Docs:

* Fix formatting and typos (conda#9623, conda#9689, conda#9898, conda#10042)
* Correct location for yum repository configuration files (conda#9988)
* Clarify usage for the `--channel` option (conda#10054)
* Clarify Python is not installed by default into new environments (conda#10089)

Miscellaneous:

* Fixes to tests and CI pipelines (conda#9842, conda#9863, conda#9938, conda#9960, conda#10010)
* Remove conda-forge dependencies for developing conda (conda#9857, conda#9871)
* Audit YAML usage for `safe_load` vs `round_trip_load` (conda#9902)

Contributors:

* @alanhdu
* @angloyna
* @Anthchirp
* @Arrowbox
* @bbodenmiller
* @beenje
* @bernardoduarte
* @birdsarah
* @bnemanich
* @chenghlee
* @ChihweiLHBird
* @cjmartian
* @ericpre
* @error404-beep
* @esc
* @hartb
* @hugobuddel
* @isuruf
* @jjhelmus
* @kalefranz
* @mingwandroid
* @mlline00
* @mparry
* @mrocklin
* @necaris
* @pdnm
* @pradghos
* @ravigumm
* @Reissner
* @scopatz
* @sidhant007
* @songmeixu
* @speleo3
* @tomsaleeba
* @WinstonPais

4.8.3 (2020-03-13)

Docs:

* Add release notes for 4.8.2 to docs (conda#9632)
* Fix typos in docs (conda#9637, conda#9643)
* Grammatical and formatting changes (conda#9647)

Bug fixes:

* Account for channel is specs (conda#9748)

Contributors:

* @bernardoduarte
* @forrestwaters
* @jjhelmus
* @msarahan
* @rrigdon
* @timgates42