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/Base/BoundBoxPyImp.cpp

@@ -196,7 +196,7 @@ PyObject*  BoundBoxPy::getIntersectionPoint(PyObject *args)
             return new VectorPy(point);
         }
         else {
-            PyErr_SetString(PyExc_Exception, "No intersection");
+            PyErr_SetString(Base::BaseExceptionFreeCADError, "No intersection");
             return 0;
         }
     }