Update to 0.9.9.7. Supposedly improves iOS support and:
Functionality Enhancements

    Add support for incoming requests to be content-encoded with gzip, deflate or compress.
    Add page for listing external calendar binds.
    Implement basic support for supported-calendar-component-set in MKCALENDAR/MKCOL.

Bug Fixes

    Additional work on CalDAV scheduling extensions should now make this usable.
    Further fixes to the handling of time-range queries in the calendar-query report.
    Fixes to the timezone service introduced in 0.9.9.6
    Fix multi-calendar import in tools.php
    Fix casting to handle integers as usernames.
    Fix default_permissions errors with LDAP updates.
    Fix LOCK handling when no timeout is supplied.
    Ensure default addressbook collections are, in fact, created as addressbook collections.
    Fix handling of BYMONTHDAY=-N in RRULEs
    Fix handling of RRULE with COUNT=X and FREQ=WEEKLY where X is not divisible by the number of values in a BYDAY part.

Other Changes

    Minor changes to handle Kerberos authentication provided by the webserver.
    Most use of the deprecated iCalendar class has been switched to use the new vCalendar class.
    Make sync-token a URI to comply with most recent definition of webdav sync.

Depend on libawl-0.49.
Remove legacy pgsql dependencies, I think they're not needed since 0.9.9.4.

(wiz)