and GroupDAV. The "sessionid" get's constructed from the basic auth
credentials and is not random (as the clients dont store them).
--> speeds up the use of *DAV
--> stops *DAV handlers to created numerious sessions
- exceptions get now always logged to the error_log
- in the webgui it's now configurable, if the message contains a
stacktrace (incl. function arguments) - default no (security)
- command line interfaces get detected and contain no html anymore
- webdav and groupdav send the exceptions as basic auth realms to the
client
- webdav and groupdav login failures contain the reason as part of the
basic auth realm
