Support OFFSET and (OFFSET ABBR) time zone rules
This simplifies Gnus and VC time zone support, by letting them feed the output of ‘current-time-zone’ and ‘decode time’ to primitives that accept time zone arguments. * doc/lispref/os.texi (Time Zone Rules, Time Conversion): * etc/NEWS: * lisp/gnus/message.el (message-insert-formatted-citation-line): * lisp/org/org.el (org-timestamp-format): * src/editfns.c (Fformat_time_string, Fdecode_time): (Fcurrent_time_string, Fcurrent_time_zone, Fset_time_zone_rule): Document new behavior. * lisp/gnus/gmm-utils.el (gmm-format-time-string): * lisp/vc/add-log.el (add-log-iso8601-time-zone): Mark as obsolete, as it is now just an alias or narrow wrapper around format-time-string. * src/editfns.c (tzlookup): Also support integer OFFSET and list (OFFSET ABBR) as time zone rules. (Fencode_time): No longer need a special case for a cons ZONE. (Fcurrent_time_zone): If the time zone string is missing, compute it the same way the other new code does.
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