ociobakelut: sets default description for icc creation (and other tweaks)
ociobakelut: sets default description for icc creation (and other tweaks)

- Updated src/apps/ociobakelut/main.cpp to now set the default --description (for icc creation) to be the filename.icc
- Also updated the --help text for the --description to say that default value is "filename.icc"
- Removed the dead code path that returns an error if the user doesn't set a --copyright flag. Also updated the --help to say what the default behavior for --copyright is.
- Added verbose message about setting the default description if none is provided, when creating an ICC profile

AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO