making "type" into "realm" and default the realm to "type"

The system is somewhat flexible even though it works in a default manner. For example, the decrementer can be form_altered to incorporate different rules.

It would be nice to have a similar system for different realms. This would require:

1. Renaming the "type" column in the DB to realm
2. Providing a system similar to the userquota_decrement field
3. The manage screen would need some modifications to make it handle this concept
4. The userquota_check_limit would have to be expanded to somehow handle this

Postponed because it is really only important for future theoretical purposes of the module and not current needs.