Add a boolean column called 'protected' to the Label model.
Protected labels will not be allowed to be directly applied, but
will be applied as a part of another process (like signoffs).
We also create a data migration which sets some existing labels
as protected (ADV(OK|NO), (H1|L1|V1)(OK|NO))

'EM_Superseded ' -> 'EM_Superseded'. This has been fixed manually on
all servers.  Note that it wasn't a problem on the production
server because that migration was "reworked" within the last year
and was not actually applied in production (it was 'faked').

* Consolidated *all* of the search stuff into the search app
  (previously the flexigrid stuff was in events/superevents)
* Completely removed the old events-only search and latest views,
  templates, etc.
* Removed some old unit tests which tested the events-only search

Instruments should be read from the coinc_inspiral table,
not the coinc_event table.  Fix this for all CBC pipelines and
for Omega, too.

Remove handling for .gwf event files for MBTA submissions.
Comments indicate that this was deprecated in 2014 and could be
removed in 2015.

The serializers for logs and emobservations (for both events and
superevents) now give the user's full name for web views (unless
it's blank; then fallback to username) and the username otherwise.
We check for web view 'status' by seeing whether it is an AJAX
request. This matches the previous behavior before the development
of the superevents features.

Small improvement to create_event mixin for unit tests.

If an event is crated with labels attached, we issue 'label_added'
alerts as well.  The event is created, the 'new' alert is issued,
then each label is added and an alert is sent for each label.

New format for LVAlerts (XMPP alerts).  New class-based
functionality for issuing alerts for events and superevents.
See https://git.ligo.org/lscsoft/gracedb/issues/8.

Added a 'get_subclass' method to the Event model which is used to
get the CoincInspiralEvent, GrbEvent, etc. corresponding to that
Event.

Changing signoff form and expose/hide button on the superevent
web display to make an AJAX request to the relevant API endpoints.
This way, we don't have to maintain separate permissions and views
for web resources.

Fixed two bugs in web-based event log creation: first, attempts
to save an EventLog with a null filename, and attempted creation
of the 'lvem' tag with the wrong information, possibly resulting in
an IntegrityError due to duplicate tags.

Moved events.api and superevents.api into the new api app.
We want to have a versioned API, so these are now in
api.v1.events and api.v1.superevents, respectively. Part of this
change is that we require a custom reverse function (api_reverse)
for handling versioning. Much of the required code changes for this
migration include converting reverses to use this function and
changing relative imports appropriately.

The "full_filename" property for Log objects is now called the
"versioned_filename" to improve clarity.

Superevent categories are now exposed by the API root, for
use in gracedb-client.

Adding utils to Superevent and Event models for comparing
categories and deciding if an Event is the correct category to be
part of a superevent.

Models which inherit from AutoIncrementModel can now specify
more than one constraint.  Needed for superevent categories.

Adding serialized label object to label creation and removal
alerts.  This may not be permanent, but some users want this
feature since the object contains a 'self' link which
they use to tell alerts from different servers apart.

Adding DQOK, PASTRO_READY, EMBRIGHT_READY, SKYMAP_READY,
GCN_PRELIM_SENT labels in advance of first OPA test.

A list of superevents which need operator signoff will appear
on the home page if the user signs in from an IFO control room.

New /latest/ page includes events and superevents. We also
move the old events 'latest' page to /events/latest/, changed the
view name, and fixed reverses to that page appropriately.

Adding view functions, templates, and full nasty javascript
to get a more complete and (hopefully) temporary implementation
of the superevent detail view ready. This includes buttons for
allowing/removing LV-EM access and forms for signoffs.

Added some utilities for handling signoffs for superevents,
including alerts, labels, logs, etc.

Small update to methods which build VOEvent files for events
to match superevents and play nicely with changes to
gracedb-client.

Adding ability to create_emobservation to handle comma-separated
strings as input rather than lists, which is necessary for handling
input from the web form on the event pages.

Updating create_emobservation to work for new
gracedb-client method of uploading emobservation
parameters.

Allow EMObservation fields ra, dec, raWidth, and decWidth to be
blank in forms, resulting in a null database entry.

Modified events.view_utils.reverse to return an absolute url using
core.urls.build_absolute_uri.  This is helpful for when we issue
alerts without a request object available to construct the absolute
url.  Also updated the corresponding *toDict methods so as to
take advantage of this.

Changing from ISO format to another more readable format for
serialization functions in events/view_utils.py.  Changes for
things like EMObservations, EventLogs, etc.