Make Area model configurable

[PeteCoward]

This is intended to allow an implementing project to say, hey I'd love to use simple_locations, but I want my location model to have an extra field, maybe an extra field to the django Group model for example, or an alternative code.

Not fully tested in implementing project as yet, but here I have

• separated out AbstractBaseArea / AreaType / Point / ProjectedArea / Border
• methods to get an abstract base class for each from an implementing project, from which that project can inherit a model of it's own taking advantage of the features
• intention is to include simple_locations as a dependency, but NOT an installed app
• (migrations updated simple locations id fields to BigAuto)

[PeteCoward]

draft until I test it more in a project

[PeteCoward]

This has issues ...

It produces migrations in simple locations because simple locations picks up the configured model, and removes its own Area model and updates the Fk fields of the other models to match.

I think I'll have to explore removing simple locations from my INSTALLED_APPS, but keeping the dependency, and overwriting the required bits on inherited models

[PeteCoward]

Promising so far, example use is

from simple_locations import base_models as sl_bases


class PlaceType(sl_bases.AbstractBaseAreaType):
  class Meta:
    verbose_name = _("place type")
    verbose_name_plural = _("place types")

class Point(sl_bases.AbstractBasePoint):
  class Meta:
    verbose_name = _("place type")
    verbose_name_plural = _("place types")

PlaceBase = sl_bases.get_area_base(PlaceType, Point)
class Place(PlaceBase):
  groups = models.ManyToManyField(Group, related_name='groups')
  class Meta:
    verbose_name = _("place")
    verbose_name_plural = _("places")