Simplify apache configuration

This is an attempt to simplify the apache configuration a little bit. The changes will have the following impact:

For specific user/branch (ltuser as example)
- `/ltuser/prod` **does not exist** anymore
- `/ltuser` directly, which points to the `prd` directory
- `/ltuser/src` is working as before and contains the debug version

For main
- `/main/*` **does not exist** anymore at all
- `/src`will contain the debug version
- `/` will contain the prod version

I've tested it on main, and it's working. ~~There is just one remainign thing. When restarting apace, I have the following warning:
`[Tue Jul 22 15:41:16 2014] [warn] The ScriptAlias directive in /etc/apache2/sites-enabled/25-mf-geoadmin3.conf at line 25 will probably never match because it overlaps an earlier Alias.`~~

~~Any idea on how to get rid of this warning?~~