Change UserProfile relations to be User relations

[micolous]

For historical/n00b reasons, all of the relations in Tollgate are based on the t.f.m.UserProfile object, rather than the d.c.a.m.User object.

These should be migrated to be relations of the User object instead. This will help reduce the complexity of some queries. A migration will need to be created in order to switch over to using User objects.

[micolous]

I've started refactoring this in the branch issue-58. Most of the calls seem to be caught, but needs some thorough testing to be user. The templates are probably incomplete at this stage.

It includes a 4 step database migration:

• 0006: Adds User relations
• 0007: Migrates UserProfile relations to User (non-reversable)
• 0008: Deletes UserProfile fields (non-reversable)
• 0009: Renames conflicting field names from *_u to *.