Changes to diffExp, diffSplice output and error/warning messages
- Reorganized diffSplice and diffExp outputs; added human readable p-adj filtered tables
- Improved diffSplice error and warning notifications
- flake 8 code cleanup
- Fixed wiggleWindow bug (was not getting passed on from flair to ssPrep) and set default to 15
- Reorganized usage statements
- Added sanity checks and warnings