Release 0.9.0 of DAViCal CalDAV server

I have not been able to put a lot of effort into DAViCal over the last couple of months, since my father was diagnosed with stomach cancer in early September, and he died on 2nd October.

So here it is, finally, including a lot of refactoring work around the handling of DAV/CalDAV REPORT requests and implementation of the DAV::principal-property-search report. This also requires an upgrade to the latest AWL library (0.20), which includes a complete rewrite to the class used for parsing and rendering iCalendar data.

This release is recommended, since you will need some of this stuff to support the upcoming Mozilla Calendar 0.7 release properly.

At this point I have only released the files to http://debian.mcmillan.net.nz/ and I'll push it out to a wider audience if I don't here screams of anguish from people in the next few days :-)

This release does not have any associated database changes, so it should be a simple matter to install the upgraded code.