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	argument list passed to doprnt, we must use separate indices for
	the array of arguments passed to Fformat, and the array of
	arguments to be passed to doprnt.

	changes.

	* editfns.c (Fcurrent_time_zone): Take an optional argument specifying
	what (absolute) time should be used to determine the current time zone.
	Yield just offset and name of time zone, including DST correction.
	Yield time zone offset in seconds, not minutes.
	(lisp_time_argument, difftm): New functions.
	(Fcurrent_time_string): Use lisp_time_argument.
	* systime.h (EMACS_CURRENT_TIME_ZONE, EMACS_GET_TZ_OFFSET,
	EMACS_GET_TZ_NAMES): Remove.
	* config.h.in: Add HAVE_TM_ZONE.

	than the current one.
	* insdel.c (modify_region): New argument BUFFER.  Select that
	buffer while we prepare for the modification, and switch back when
	we're done.
	* textprop.c (add_properties, remove_properties): Pass
	the buffer being modified as the first argument to modify_region.
	* editfns.c (Fsubst_char_in_region, Ftranslate_region): Pass the
	current_buffer as the first argument to modify_region.
	* casefiddle.c (casify_region): Same.

	nil if the time zone information is unavailable, instead of
	signalling an error.

(save_excursion_restore): Restore mark_active of buffer.
Run activate-mark-hook if it's on, or deactivate-mark-hook if it turns off.
(region_limit): Error if mark inactive, if transient-mark-mode.

	args[0] == Qnil.

(Fcompare_buffer_substrings): Likewise.

	message; let the minibuffer contents show through.

	(Finsert_buffer_substring): Call graft_intervals_into_buffer().
	#include "intervals.h".

	Formatting tweaked for readability.

        indicate that we will probably add the timezone to the end,
        now that we have it available on many systems.

	* editfns.c (Fcurrent_time_zone): Don't forget to include code to
	signal an error when EMACS_CURRENT_TIME_ZONE is not defined.

	* editfns.c (Fcurrent_time_zone): New function.
	(syms_of_editfns): defsubr it.