Removed 'not' keyword and cleaned up reference_wrapper usage
Removed 'not' keyword and cleaned up reference_wrapper usage

opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core