Adds 'flags.py' by John RA Benson to thorium.utils
Adds flags to utils imports and exports
Fixes labeling issues with set_link()
Adds documentation for Groupmo class
Fixes various SpillSuppress bugs, adds documentation
Updates README to list new thorium modules
Adds 'help' knob to Groupmos
Adds normalize_docstring() function to make it easier to use class docstrings as Nuke node help.
Adds 'help' to SpillSuppress
Tweaks Groupmo style
Tweaks SpillSuppress gain/gamma help to be more accurate.
Minor bugfixes