webdav is always enabled

After reading 
http://stackoverflow.com/questions/9127269/how-can-i-stop-people-accessing-a-plone-server-via-webdav, 
i checked and discovered that indeed WebDAV is always enabled in Zope. I 
tested on 4.2, but Martijn Pieters said that it was always the case. I 
posted something on 
http://keeshink.blogspot.de/2012/09/how-to-disable-webdav-in-plone.html, 
but the doc should be updated i think.

I've updated my fork of collective.developermanual, here is my pull 
request: https://github.com/collective/collective.developermanual/pull/68

Should we also remove the bit about "Enabling WebDAV in Zope" from 
http://plone.org/documentation/kb/webdav? Right now it's in 2 places 
(also in c.developermanual), and i think a developer will prefer the latter.

Kees



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