http_dav.c: make sure that REPORT doesn't crash on principal namespace (even though we don't support any reports yet)
http_caldav.c: don't bother attempting scheduling operations when PUTting anything other than VEVENT or VTODO
httpd.c, http_caldav.c, caldav_db.c: start of support for VAVAILABILITY (requires patched libical)
http_timezone.c: for action=get on an alias substitute the alias as TZID property and add EQUIVALENT-TZID property, per draft-douglass-timezone-service-09
http_timezone.c, zoneinfo_db.c: do case-insensitive "glob" style matching (including ' ' == '_') for action=find, per draft-douglass-timezone-service-09
zoneinfo_db.c: typo in comment
http_dav.c: don't return DAV:add-member for Scheduling Inbox/Outbox
http_caldav.c: Bron's better fix for Apple empty If-Schedule-Tag-Match problem
tls.c: don't setup external session cache until all other config/init is done on server context
http_caldav.c: squash a pesky compiler warning
http_caldav.c: don't send updates for an unknown method
http_caldav.c: nit
configure.in, http_caldav.c: support CalDAV scheduling parameters in iCalendar with both libical < v1.0 (using IANA params) and libical >= 1.0 (using built-in params)