Revert "Correct the Python_module handling"

    This reverts commits 33671f54 and
    52fdc8e5.

    These commits introduce a bug in the generation of python modules:
    shared objects wrap.so have been renamed but __init__.py files still try
    to import them with the old name.

src/CMakeLists.txt

@@ -58,10 +58,13 @@ FOREACH(lib ${libs})
   INSTALL(TARGETS ${lib} DESTINATION lib/plugin)
   # build python submodule
   STRING(REPLACE - _ PYTHON_LIBRARY_NAME ${lib})
-
+  ADD_DEPENDENCIES(${lib} MKDIR_${PYTHON_LIBRARY_NAME})
+  ADD_CUSTOM_TARGET(MKDIR_${PYTHON_LIBRARY_NAME}
+    mkdir -p dynamic_graph/sot/dynamics/${PYTHON_LIBRARY_NAME}
+    )
   DYNAMIC_GRAPH_PYTHON_MODULE("sot/dynamics/${PYTHON_LIBRARY_NAME}"
     ${lib}
-    sot-dynamics-${PYTHON_LIBRARY_NAME}-wrap
+    sot/dynamics/${PYTHON_LIBRARY_NAME}/wrap
     )
 ENDFOREACH(lib)