http_caldav.c: make sure that SEQUENCE is set properly on requests
http_caldav: don't leak FB request if its malformed; don't free attendee prop in FB request until we're done using it
http_caldav.c: remove all libical X-LIC-ERROR props before storing object
http_caldav.c, http_carddav.c: supported auto-provisioning of calendars/addressbooks on a frontend proxy
http_caldav: remove useless check for DAV DB in meth_get()
httpd.c: added supporting for Content-Disposition filename in HTTP response headers
http_caldav.c: added filename (based on DAV:displayname or mboxname) when exporting a whole calendar
http_caldav.c: split GET on calendar collection into it own dump_calendar() function
http_proxy.c, http_rss.c: split parsing of Forwarded header into protocol and host parts into its own function (http_proto_host())
httpd.c, http_rss.c, http_ischedule.c: make calc_compile_time() a globally accessible function
http_caldav.c: GET on calendar-home-set now returns a list of subscribe-able calendars
http_caldav.c: use cyrus.index mtime as Last-Modified when dumping a calendar