Custom Data APIs for Group, Activity, Contribution

Verify OR implement (if not implemented) Custom Group/Field/Data API functions for Group, Activity and Contribution classes. These classes should have the same API support as the contact classes.

Supported functions for these classes should include:

• all the functions in api/CustomGroup.php (e.g. create_custom_group, create_custom_field, etc.)
• get_$class () functions (i.e crm_get_group) should return custom properties
• create and update functions for these classes should support passing custom field values

NOTE: I think Contribution has some or most of these - didn't look like Group had this support yet - altho I may have missed it.

NOTE: In a quick scan of CustomGroup.php - I didn't see update functions for many of the objects (custom_value, custom_field, etc.). Are these somewhere else or not yet supported? If not supported, seems like we would need them (especially custom_value).