[WIP] Simplify apache configuration

Do not merge yet.

Basically, this gets rid of `/main/` and `wsgi` parts of urls. It also simplifies the apache configuration by rewriting all requests (there are exceptions) to the wsgi application.

This has been tested unter /ltjeg and with pserve. Yet to be tested in main (this afternoon :) )

I'm pretty sure the execptions like crossdomain.xml and capabilites files that still remain can also be moved into the wsgi application.

Groundwork done by @procrastinatio with #877.