Mayflower/PHProjekt — pull request #155 by voidus (2012-02-23 11:28:16+00:00)
Title: Correctly detect unsupported caldav operations.

An api misunderstanding caused us to miss some kinds of unsupported operations.

This still is a problem, though: Both the iPad (and iPhone I assume) and
thunderbird ignore the 501 that get's sent to them. To the user, everything
looks fine.