Expand DataTable_ interface to enable removal of data table columns (removal of rows was already included).
Expand DataTable_ interface to enable removal of data table columns (removal of rows was already included).

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