Attacher: Py: introduce Py interface of AttachableObject

Small - just the introduction.
Support for Py features based on AttachableObject.
Redirect Part2DObjectPython's father to be AttachableObjectPython.

src/Mod/Part/App/AttachableObjectPyImp.cpp

@@ -0,0 +1,48 @@
+
+#include "PreCompiled.h"
+
+#include "Mod/Part/App/AttachableObject.h"
+#include "OCCError.h"
+
+// inclusion of the generated files (generated out of AttachableObjectPy.xml)
+#include "AttachableObjectPy.h"
+#include "AttachableObjectPy.cpp"
+
+using namespace Part;
+
+// returns a string which represents the object e.g. when printed in python
+std::string AttachableObjectPy::representation(void) const
+{
+    return std::string("<Part::AttachableObject>");
+}
+
+PyObject* AttachableObjectPy::positionBySupport(PyObject *args)
+{
+    if (!PyArg_ParseTuple(args, ""))
+        return 0;
+    bool bAttached = false;
+    try{
+        bAttached = this->getAttachableObjectPtr()->positionBySupport();
+    } catch (Standard_Failure) {
+        Handle_Standard_Failure e = Standard_Failure::Caught();
+        PyErr_SetString(PartExceptionOCCError, e->GetMessageString());
+        return NULL;
+    } catch (Base::Exception &e) {
+        PyErr_SetString(Base::BaseExceptionFreeCADError, e.what());
+        return NULL;
+    }
+    return Py::new_reference_to(Py::Boolean(bAttached));
+}
+
+
+PyObject *AttachableObjectPy::getCustomAttributes(const char* /*attr*/) const
+{
+    return 0;
+}
+
+int AttachableObjectPy::setCustomAttributes(const char* /*attr*/, PyObject* /*obj*/)
+{
+    return 0;
+}
+
+