replace_source_model
Description:
Replaces source->data_model with model, which must have the same characteristics as source->
data_model (same column types)
Also for each Holder for which source->data_model is a source model,
this method calls set_source_model with model to replace
the source by the new model
Parameters:
| this |
a Set object |
| source |
a pointer to a SetSource in this |
| model |