Git staging script improvements and general cleanup

[rdswift]

Summary

This is a…

• Correction
• Addition
• Restructuring
• Minor / simple change (like a typo)
• Other

Reason for the Change

General cleanup and add command line options to git file staging script.

Description of the Change

Changes include:

• Rename stage_translation_files.py to gitstage.py
• Add command line options to gitstage.py
• Refactor and optimize gitstage.py
• Add module docstring to conf.py
• Remove unnecessary subscript in setup.py

The help for gitstage.py is:

usage: gitstage.py [-h] [-r] [-c [{none,changed,all}]] [-s] [-d] [-f] [-a] [-w]

options:
  -h, --help            show this help message and exit
  -r, --rst             also stage rst files
  -c [{none,changed,all}], --comparison-display [{none,changed,all}]
                        none = don't show any diffs, changed = show only changed diffs (default), all = show all diffs
  -s, --silent          supress all program output
  -d, --dry-run         don't stage the files (report only)
  -f, --files-save      save the git output to files
  -a, --about           display information about the script
  -w, --warranty        display warranty information

Additional Action Required

None.