[Owncloud] Update to sabredav 1.6

[Christophe]

Hi everyone,

I would strongly prefer SabreDAV 1.6 over PHP 5.2 support, though you 
can't argue with security support. RHEL 5 still supports PHP 5.1.6(!) 
and Ubuntu 8.04 comes with PHP 5.2.4. (:

Christophe

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