FEM: Remove unnecessary overrides from Analysis

onChanged, execute, mustExecute and getPyObject where overwritten but
the implementation didn't do anything different from the implementation
of the base class DocumentObject in this case. Thus they where
redundent.

src/Mod/Fem/App/FemAnalysis.cpp

@@ -48,21 +48,6 @@ FemAnalysis::~FemAnalysis()
 {
 }
 
-short FemAnalysis::mustExecute(void) const
-{
-    return 0;
-}
-
-PyObject *FemAnalysis::getPyObject()
-{
-    return App::DocumentObjectGroup::getPyObject();
-}
-
-void FemAnalysis::onChanged(const Property* prop)
-{
-    App::DocumentObjectGroup::onChanged(prop);
-}
-
 void FemAnalysis::handleChangedPropertyName(Base::XMLReader &reader,
                                             const char * TypeName,
                                             const char *PropName)