Log Message:
Update to 2.3.1
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v2.3.1
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[jan] SECURITY: Escape output in test.php.
[jan] Add script to import contacts from SquirrelMail database.
[gwr] Correct support for the freebusy URL in Kolab.
[gwr] Add photo support for the Kolab driver.
[jan] Import broken vCards from Synthesis clients (Bug #7407).
[cjh] Add two retries to find a contact after adding it (Bug #7478).
[cjh] Add a PostgreSQL-specific upgrade script for 2.2.1 to 2.3
      (michael.menge@zdv.uni-tuebingen.de, Bug #7462).
[jan] Don't overwrite empty address books preference when creating new shares
      (Bug #7399).
[mms] Upgrade prototype.js to v1.6.0.3.