fixes #0001422: Subclass Exception

inherit Base.FreeCADError form RuntimeError
inherit Part.OCCError from Base.FreeCADError
inherit OCCDomainError from Part.OCCError
inherit OCCRangeError from Part.OCCError
inherit OCCConstructionError from OCCDomainError
inherit OCCDimensionError from OCCDomainError
Added PY_CATCH_OCC macro
replace PyExc_Exception
use FreeCADError in makeWireString
catch exception in BSplineCurve.increasedegree

src/App/ApplicationPy.cpp

@@ -220,7 +220,7 @@ PyObject* Application::sSetActiveDocument(PyObject * /*self*/, PyObject *args,Py
         GetApplication().setActiveDocument(pstr);
     }
     catch (const Base::Exception& e) {
-        PyErr_SetString(PyExc_Exception, e.what());
+        PyErr_SetString(Base::BaseExceptionFreeCADError, e.what());
         return NULL;
     }