This is necessary since we use --system-site-packages to create
the virtualenv, and the system version of numpy is too old.

* Switch from VOEventLib to voevent-parse due to significant
  string-bytes issues in VOEventLib
* Remove bad exception handling in events API for creating a
  VOEvent
* Add parameter checking to events API for creating a VOEvent
* Combine VOEvent building code for events and superevents into
  a single instance which handles both cases

For Python 2, we install VOEventLib from a git fork since upstream
is not Python 2-compatible.  But we don't need to do that for Python 3!

There were problematic non-backwards compatible API changes from
2.3.0 to 2.3.1... nice, pyparsing.  Didn't catch this previously.

Duncan Macleod authored 5 years ago and Tanner Prestegard committed 5 years ago

the former is available for python3, the latter is not

Not obvious how we were getting this installed previously,
but we have to fix the version. 2.4.0 was being installed in some
instances which was causing parts of the search to break.

Certain filters are being moved out of the djangorestframework
package and into djangorestframework-guardian.

Upgrade gunicorn to 19.9.0 and switch to an asynchronous
worker class

Not sure why this started happening all of a sudden since we have
been using 2.5.2 for quite a while.  But trying to pip install
python-ldap when building a Docker image keeps giving a
UnicodeDecodeError. Updating to version 3.1.0 seems to resolve it.

Add django-user-sessions package for more easily managing sessions
and correlating them with user accounts.

Upgrade to newest LVAlert package and fix some requirements.
There is a bug with sleekxmpp and certain versions of pyasn1-modules,
so we revert the version of that and pyasn1. We also remove some
requirements which are really dependencies of requirements.