Fix warnings (BlueBrain#27)

* Fix warnings
* update tox config for actions

---------

Co-authored-by: Mike Gevaert <[email protected]>

upgrade to pandas 2.0 groupby (BlueBrain#21)

- Fix outer value lookup with vector data (BlueBrain#19)
- Fix compatibility with groupby from pandas 2.0

Switch hemisphere constants to be in line with AIBS (BlueBrain#17)

* Based on this:
https://github.com/AllenInstitute/CCF_Tutorial/blob/63914f6c4b666428d3e2f2bd9b934519d23581dd/CCF_Tutorial.ipynb
    "We'll use a hemisphere id of 1 for the left hemisphere and 2 for the right."

The hierarchy file also contains hemisphere ids, but only '3' is used, likely to specify 'both'.

Create a pandas dataframe from an region_map hierarchy (BlueBrain#6)

remove some of the pylint exceptions, fix the resulting style errors (B…

…lueBrain#4)

* no longer disabling `len-as-condition` and `no-else-return`

OSS updates