Fix some lint errors.
Fix short variable naming error produced by pylint.
First stage of refactoring for pylint strictness.  Some bugs found with
rsync skip logic have also been fixed that were found during
refactoring.
More refactoring.  Trying to put gsync back into a working state.
Fixed more pylint errors, warnings and recommendations
Added a test for new style DriveFile class.  Applied pylint fixes to
some more modules.
Fixed many pylint errors and warnings.