python-webdav Code

Decided that it would be worth migrating over to lxml but most of the work is not done so beware!"

cleared up the new shell example and revealed a bit of a bug so now its broken

Got rid of the old xml parsing and replaced it with something simpler. Started to
reorganise the modules so that it's a bit more coherent and obvious. Have not updated
the documentation to reflect this and will not until it's finished.

Added parse.py which is not meant for general use yet. Uses a different xml parsing module