bos #24009 EDF 22760 - integration of dev in SMESH: minor problems
1/ Remove explicit memory leaks (e.g. CORBA ptr are not destroyed).
2/ Remove redundant includes.
4/ Fix architectural problems: avoid raising CORBA exceptions from low level, instead catch and rethrow exceptions from upper level.
7/ Fix declarations - IDL stubs overrides must not be declared as raising std exceptions.
10/ Remove redundant code duplication. In particular class ToComment to be replaced by existing SMESH_Comment.
11/ Clean-up unused member fields.
12/ Fix errors in documentation.
