This patch removes plexus-webdav in favor of Jackrabbit's webdav servlet implementation. It is not yet 100% completed and tested. HTTP GET and PUT should work correctly.
The following needs to happen before integration:
1) New Jackrabbit classes need to be correctly unit tested.
2) Webdav properties need to be implemented
3) Testing of common webdav clients - Mac OS X, Windows, Wagon-Dav, etc