Localize EMFootprint start times to UTC.
Changed event creation time query to assume UTC.

and email notifications. This is done by parsing
the label query separately and applying the filter
in a separate step.

- Removed south from installed apps.
- Moved migrations to south_migrations.
- Added new migrations directories.
- MIGRATION_MODULES setting.
- Added initial migrations
- Added TEST_RUNNER setting.
- Updated wsgi file.
- Changed mimetype arg in HttpResponse to content_type.

Fixed userprofile forms to allow blank far threshold. You have to set blank=True,null=True on the model field *and* required=False on the form field.

I guess there was a final schema migration that Brian had left undone for the userprofile app. Here it is.

Models referenced non-existent fields in Django User model.
(fields which used to reference an obsoleted LIGO User model.