Simplify apache configuration

Do not merge yet.

Basically, this gets rid of `/main/` and `/wsgi/` parts of our api urls. It also simplifies the apache configuration by rewriting all requests to the wsgi application (there are exceptions).

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.


Event. remove this route and the corresponding entry in lufbild.py, and make a redirect in apache