add 'depth' to dav operational logging.

http://subversion.tigris.org/issues/show_bug.cgi?id=2913







------- Additional comments from kfogeltigris.org Mon Oct  8 13:26:48 -0700 2007 -------
Er, and r29706 made it "depth-" instead of
"depth=", for similarity with Apache
httpd logs.


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