When applied, this makes a view publicly available *if* the
settings.UNAUTHENTICATED_ACCESS switch is True; otherwise you
must be authenticated. This will be useful to propagate to
most other views to make this settings switch globally effective
at some point.

Should have been done initially; this is a holdover from
development of this feature where it was just visible to EM advocates.

Move some unused/non-functional menu items to live under a new
"Other" item: create (event), reports, and RSS.

Some improvements and cleanup to SupereventPublic

Data migration to populate new database columns for existing
VOEvents. We have to read the files in and try to extract the
parameter data, handling all of the changes to the file format
which have occurred over time.

I did a lot of testing by copying over the production database
and associated VOEvent files for all non-Test, non-MDC events
and superevents to make sure we are accounting for all changes
in VOEvent (file) schema that have happened over time.

We can change a few things about how the VOEvent file building
works now that all of the relevant parameters are stored in the
database.

There are several fields that the user provides to create a
VOEvent through the API, which are used in generating the VOEvent
file, but are not stored in the database. Let's fix this!!