SALOME 6.3.1 corrections from PPGP team:

SALOME 6.3.1 corrections from PPGP team:
1. Correction of the module's root data object creation - it now depends on the concrete study type (light or full)
2. Extending SalomePyQt API by two methods: get active Python module object, activate SALOME module with the given name
3. Minor correction: scaling the module's icon in Obj. Browser to 16x16 size to avoid ugly huge pixmaps for some light modules.