Log Message:
Update to 2.3

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v2.3
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[jan] Change group field in shares table to work with LDAP groups (Bug 6883).
[jan] Fix user name conversion with user hooks in the calendar panel
      (Bug 7366).
[gwr] Fixed handling of free events in the Kolab driver
      (noethen@uni-paderborn.de, Bug 7192).
[jan] Differentiate between days with events and days with busy events in the
      year view.

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v2.3-RC1
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[jan] Send correct iTip notifications when deleting recurring event instances
      (Bug 6636).
[mjr] Add support for embedding calendar widgets on external websites.
[jan] Log moving of events in the history backend (Bug 3207).
[jan] Fix listing alarms of recurring events crossing day boundaries
      (Bug 7035).
[jan] Fix deleting all events over WebDAV (Bug 7005).
[jan] Add Atom feeds.
[jan] Fix encoding of holiday names.
[jan] Add Estonian translation (Alar Sing <alar.sing@err.ee>).
[jan] Consider RECURRENCE-ID attributes in iCalendar data.
[cjh] Fix a problem with the put() API call and events that already exist
      (almarin@um.es, Bug 7088).
[jan] Fix importing iCalendar events with only a single recurrence exception
      (guyzdm@gmail.com, Bug 7068).
[jan] Add Basque translation (Euskal Herriko Unibertsitatea EHU/UPV
      <xabier.arrieta@ehu.es>).
[mjr] Add support for maintenance tasks and add a task for purging old events.
[jan] Fix future events not being received under certain circumstances
      (Bugs 6946, 6966).
[jan] Correctly sort recurring events (develop@kristov.de, Bug 7037).
[jan] Fix display of recurring events crossing midnight in the portal block
      (develop@kristov.de, Bug 7036).
[jan] Fix agenda emails containing wrong events.
[mjr] Remove user permissions on all shares when deleting a user.
[jan] Fix warning when importing events through the API (Bug 6865).
[cjh] Be case insensitive when comparing attendees
      (aloyse.gilbert@gmail.com, Bug 6833).
[jan] Use smaller icons for private events.