WebRequest::loadParameters refactoring

[mike]

To quote graeme from the development list:

The code to parse the PATH_INFO should be conditional on AG_URL_FORMAT
(set up in settings.ini). You may want to extract all of the PATH_INFO
code to a private methods to make the code a little cleaner.

agreed.

[mike]

I think this will probably be affected by #52

[david]

we throw it out, the routing does that now

[david]

changeset:524

[david]

(In [548]) Merging in changes from branches/dominik-routing. Closes #41, #122, #128, #129, #139, #141, #111, #142, #148, #121, #124, #125, #120, #147, #38, #52, #70, #71, #72, #87, #130, #143, #146, #150, #153, #154, #155, #157, #158, #160, #149, #156, #159, #74, #151 and #152