Missed one case where 'tag' should have been 'tags' in
58efeab3. Also updated same thing
in documentation.

Fixing issue where some float fields were left as strings in
LVAlert JSONs and response JSONs.  Occurred because they were
extracted as strings from files and saving the event did not
fix the attribute types without refreshing from the database.
See https://git.ligo.org/lscsoft/gracedb/issues/10.

simplejson package is used to properly serialize Decimal objects
(like gpstime) when converting from a dictionary to a json.

Event time nanoseconds did not include leading zeros when printed
in event.log (since 2010!!). See
https://git.ligo.org/lscsoft/gracedb/issues/9.

Unsure why messaging app was not enabled; it's needed for
posting flash messages about contacts and notifications.

Javascript time zone selectors assumed the server time zone to be
America/Chicago, which we changed in
ab72e160, so we fixed that here.
Also fixed assumptions that LLO is in the same time zone as the
server.

Fixed a bug in gracedb/templates/gracedb/event_detail_script.js
which caused event logs to not render properly since the code was
trying to access a div which didn't exist.

updating flash messaging for contact/notification creation to use django message middleware rather than session

adding optional override to Event delete() method which removes data directory and all associated GroupObjectPermission objects

Repository reorganization and port to gunicorn

See merge request lscsoft/gracedb!7