The WebDAV functionality is rewritten as an appmod. Also the
locking server is run as a runmod.

The WebDAV module is checked against the litmus tests. It
passes most of the tests, the ones that are not passed are
concerning writing unsupported properties.
Merge branch 'dav-module' of ssh://github.com/imtal/yaws into dav-module

Conflicts:
	include/mod_lock.hrl
	src/Makefile
	src/yaws_server.erl
Update on dav module