(Housekeeping, refactor) Normalize whitespace for all *.py files

[aubsartre]

This PR is for normalizing the whitespace in .py files for Coalition. It:
1) changes leading tabs to spaces (4)
2) removes line trailing whitespace
3) removes tabs and spaces from lines that have no printable characters
4) adds a trailing newline to the end of the file for those without
5) removes extra trailing newlines from files that have them

as a quality-of-life improvement for coding.

This is a whitespace refactor; any side effects, or changes to code meaning, are a bug.

To get an accurate blame, use:
git blame -w

which ignores trivial whitespace changes.

[aubsartre]

To verify that the changes are only to whitespace:
git diff --ignore-space-change --ignore-blank-lines master 2918b54