* Feature release
* Main program of "webdav.WebdavClient" supports download of files. URLs without leading slash ("/") are interpreted as a downloadable file.
* The interface of "webdav.WebdavResponse.LiveProperties" is more convenient to use. Generally, missing values are interpreted as "None".
* Fixed problem when asking for a single WebDAV property. This caused a problem with collection validation with certain servers.
* Improved debug messages of "webdav.Connection.Connection".
Special thanks to Mark Rison for his valuable input!!