http_*dav.c: consolidate "get data" propfind functions
	     add support for content-type attribute when fetching CALDAV:calendar-timezone
http_caldav.c: add support for content-type attribute when storing CALDAV:calendar-timezone

Conflicts:
	imap/http_caldav.c
install-http.html: updated
start of timezone service module

Conflicts:
	configure.ac
	imap/Makefile.in
tools/vzic/*: Initial vzic-1.3
Include stdlib headers, extend supported year to 2038 (from http://tzurl.org)
Added correct line terminators (CRLF) - from http://tzurl.org
Fixed potential bug where '-' is specified as a number value (should translate
to zero) - from http://tzurl.org
Applied patch to combine multiple RRULEs into one - from http://tzurl.org
Updated outlook rule conversion to suppport changes to Pacific/Fiji definition - from http://tzurl.org
Extend supported year to 2038 - from http://tzurl.org
Added some code to vzic to make it output symlinks for all timezone links specified in the Olson database, not only some of them - from http://tools.ietf.org/tools/ietfdb
vzic.c: we don't need the dump of tz names and coords
vzic.c: we want the LINKs contained in "backward"
We don't want a prefix on our TZIDs
vzic-output.c: Add LAST-MODIFIED property to VTIMEZONE components
vzic-output.c: Why do we need X-LIC-LOCATION?
vzic-output.c: Use _CYRUS_VERSION in PRODID
vzic-output.c: use RRULEs as much as possible
http_timezone.c: added 'get' action