gis: Refactor of the `GeoQuerySet`; new features include:

 (1) Creation of internal API that eases generation of `GeoQuerySet` methods.
 (2) `GeoQuerySet.distance` now returns `Distance` objects instead of floats.
 (3) Added the new `GeoQuerySet` methods: `area`, `centroid`, `difference`, `envelope`, `intersection`, `length`, `make_line`, `mem_size`, `num_geom`, `num_points`, `perimeter`, `point_on_surface`, `scale`, `svg`, `sym_difference`, `translate`, `union`.
 (4) The `model_att` keyword may be used to customize the attribute that `GeoQuerySet` methods attach output to.
 (5) Geographic distance lookups and `GeoQuerySet.distance` calls now use `ST_distance_sphere` by default (performance benefits far outweigh small loss in accuracy); `ST_distance_spheroid` may still be used by specifying an option.
 (6) `GeoQuerySet` methods may now operate accross ForeignKey relations specified via the `field_name` keyword (but this does not work on Oracle).
 (7) `Area` now has the same units of measure as `Distance`.

Backward Incompatibilites:
 * The aggregate union method is now known as `unionagg`.
 * The `field_name` keyword used for `GeoQuerySet` methods may no longer be specified via positional arguments.
 * `Distance` objects returned instead of floats from `GeoQuerySet.distance`.
 * `ST_Distance_sphere` used by default for geographic distance calculations.


git-svn-id: http://code.djangoproject.com/svn/django/branches/gis@7641 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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