Add the new x16 d64 and update the existing d64 and sdcard image files.

Spelling out the GitHub procedure in Release-howto.md

Add v0.12 to Versions.md

Merge branch 'master' of github.com:pzembrod/cc64

Wording tweak in Versions.md

Merge branch 'v0.9-dev'

# Conflicts:
#	src/cc64/scanner.fth
#	tests/unit/Makefile
#	tests/unit/build-run-test.sh
#	tests/unit/scanner-test.fth
#	tests/unit/scanner-test.golden

Merge branch 'master' of github.com:pzembrod/cc64

# Conflicts:
#	Makefile

Remove checked-in cc64-doc.zip again

Mini doc tweak

Also for peddi tests: New mechanism to kill -9 VICE if it fails to te…

…rminate after 20 seconds.