Moved description to the level of BaseFactory

Created by: stefanoborini

Moves the description to BaseFactory, so that all factories can have one.

force_bdss/mco/parameters/base_mco_parameter_factory.py

-from traits.api import Type, Instance, provides, Unicode
+from traits.api import Type, Instance, provides
 
 from force_bdss.core.base_factory import BaseFactory
 from force_bdss.ids import mco_parameter_id