Remove apache_settings directory

To the best of my knowledge, none of those files were used.
Remove old DB schema files

They are no longer needed to set up or operate the site.
Remove Mediawiki auth module

Useful, but perhaps out of scope for this repository.
Remove webserver_settings directory

Site-specific configuration files are probably out of scope at this point.
Remove cmdline_auth.py

I don't believe we are using this anymore.
Remove 3rdparty dir

We now install iCalendar and python memcached bindings via pip.
pspicture can be installed using a Latex package manager.
Remove aws_settings.py - no longer used
Remove reloader module - no longer used