Added membership_array_all_equal parameter to HAPI_GetGroupMembership…

…() in order to quickly tell if all items are in a group or all items are outside the group.

OutputGeometryPart.C

@@ -2273,6 +2273,7 @@ OutputGeometryPart::computeGroups(
                     myAssetId, myObjectId, myGeoId, myPartId,
                     groupType,
                     groupName.asChar(),
+                    NULL,
                     &groupMembership[0],
                     0, groupMembership.size()
                     );