Replace incorrect usage of g_error (calls abort) with instead g_message followed by exit() calls. - BUG FIX

Fix bug in default setting for sort direction for min/max range values leading to unexpected negative values. - BUG FIX

Add option to allow user to specify location of git repository for other libs, e.g. gbtools. - BUILD

Add users patch to allow batch setting of black/white point for dotter grey ramp tool. - NEW FEATURE

Features were previously assumed to only be in one group, but with the addition of quick filtering functionality in 4.43.0 features can now end up in multiple groups. This change fixes problems with determining the visibility of features that are in multiple groups.