Merged changes in the trunk up to revision 55546.

Conflicts resolved:
source/blenderplayer/bad_level_call_stubs/SConscript

Partly reverted changes to intern/cycles/blender/addon/ui.py in revision 52899
to make it easier to merge trunk changes.

source/blender/python/intern/gpu.c

@@ -131,6 +131,7 @@ static PyObject *PyInit_gpu(void)
 	PyDict_SetItemString(d, # f, val);               \
 	Py_DECREF(val)
 
+#if 0  /* UNUSED */
 #define PY_OBJ_ADD_ID(d, s, f)                      \
 	val = PyUnicode_FromString(&s->f->id.name[2]);  \
 	PyObject_SetAttrString(d, # f, val);            \
@@ -145,6 +146,7 @@ static PyObject *PyInit_gpu(void)
 	val = PyUnicode_FromString(s->f);    \
 	PyObject_SetAttrString(d, # f, val); \
 	Py_DECREF(val)
+#endif
 
 PyDoc_STRVAR(GPU_export_shader_doc,
 "export_shader(scene, material)\n"