CAD — CadSystem Properties issue

In the CadServer interface we have the ability to inquire launch
properties for the CadSystem, and then pass in a set of properties
when we call connect() or connect_with_password().

Once the CadSystem is running we do not have a way to query or
change the properties.

As an example - UG has a property for the search path for files.
You can set this property when you initially start up the CadSystem.
If it needs to be changed during a session the only choice is to
shut down the CadSystem with disconnect() then call connect()
again.

Also, if you connect to an already running CadSystem you
cannot determine what properties were used during the original
connect().

I think I would propose adding something like "get_properties"
and "set_properties" for the CadSystem interface. These calls
would basically allow a query and update of the properties
provided to the CadServer via the connect() calls.

CosPropertyService::Properties get_properties();
void set_properties( in CosPropertyService::Properties props );

The proposed operations were added to the CadSystem interface.