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Bumps [django](https://github.com/django/django) from 2.2.4 to 2.2.18.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.4...2.2.18

)
Signed-off-by: dependabot[bot] <support@github.com>

Had trouble installing the 3rd party 'psutil' package on Webfaction servers.

required package for lockdown to work

Bumps [django](https://github.com/django/django) from 2.2.1 to 2.2.4.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.1...2.2.4

)
Signed-off-by: dependabot[bot] <support@github.com>

This version of Django does not require Python
SQLite to be >= version 3.8.3.  Webfaction currently is on SQLite
version 3.7.17.

Pip version is newer and compatible with Python 3.

v 2.1.7 is only supported to end of 2019.  v 2.2 is supported to
April 2022.

Has most current versions of all packages as of April 18, 2019.

pandas 0.20.1 is needed for time-based rolling averages, which will be
used in future features.

Pandas 0.19.1 has compatibility problems on Webfaction with Django.

Also, set higher Pandas and numpy versions in requirements.txt.

Also, restructuring of the Settings file into a BMON-specific file and
then a file containing Settings that are generally the same across BMON
installations.  This settings_common.py file can be put under source
control and updated as needed over time.

Also formatted admin fields for easy input, incorporated markdown into
html template, and added python-markdown to requirements.txt file

It's already included directly in the code, so does not need to be
installed.  It was a problem to install it, as pip did not work with it.

And removed _dev version of requirements file as it was not different
than the deployment version.

Reviewed and made accurate the requirements.txt file indicating which
Python packages are needed for the application.  Changed Django secret
key in the sample settings file.

Removed South app, and upgraded the old migrations to Django 1.7 format.
Used explicit default of False in Boolean fields, as Django 1.7 uses
None.