Log Message:
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.