- Add copyright headers to files that did not already have them
- Update the year to the last year the file was modified in files with
existing headers.
When installing from source WA attempts to include the commit ID in the
version of the installed pacakge however this caused issues with package
managers like pip. PEP440 specifies that local identifiers must be in the
form `<public version identifier>[+<localversion label>]` so update the
version to conform.
https://www.python.org/dev/peps/pep-0440/#local-version-identifiers
Add a function to return WA version suffixed with the commit hash for
current HEAD. This only works if WA was deployed via
python setup.py develop
otherwise, the output is identical to get_wa_version().
