Disable modifying recurring events

Fix translation

Add missing jstz.js, add possiblity to download calendar via private URI

Add support for descriptions

Add sanity-chacking to JavaScript date/time inputs

Reduce script size of JavaScript

Fix sync by actually providing a UID in all vevents

Improve TimeZone support

Add settings interface and a lot of updates

Initial import of the DAVCal DokuWiki PlugIn