Pickling queryset.query doesn't work for gis models on Oracle

[Jani Tiainen]

If I pickle queryset.query which is GIS model I get following results (using Oracle as database):
qs = MyModel.objects.filter(id=12345)

before pickling:

>>> qs.query 
<django.contrib.gis.db.models.sql.query.GeoQuery object at 0x0199FB90>
>>> qry_str = pickle.dumps(qs.query)
>>> qry = pickle.loads(qry_str)
>>> qry
<django.db.backends.oracle.query.OracleQuery object at 0x019C3F70>

Somehow query object has changed. It works as expected on non GIS models.

[jbronn]

Initial stab at this patch.

[jbronn]

(In [10615]) Fixed #10839 -- GeoQuery now unpickles properly on Oracle.

[jbronn]

(In [10616]) [1.0.X] Fixed #10839 -- GeoQuery now unpickles properly on Oracle.

Backport of r10615 from trunk.