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/PlacementPyImp.cpp

@@ -114,7 +114,7 @@ int PlacementPy::PyInit(PyObject* args, PyObject* /*kwd*/)
         return 0;
     }
 
-    PyErr_SetString(PyExc_Exception, "empty parameter list, matrix or placement expected");
+    PyErr_SetString(Base::BaseExceptionFreeCADError, "empty parameter list, matrix or placement expected");
     return -1;
 }