2006-01-06  Morten Welinder  <terra@gnome.org>

	* functions.c (gnumeric_char): Plug leak.  Handle crazy input
	values.
	(gnumeric_unichar): Handle crazy input values.
	(gnumeric_left, gnumeric_right, gnumeric_mid): Handle crazy values
	for length.
	(gnumeric_rept): Handle crazy values for count.  Speed up.  Handle
	out-of-memory gracefully.
	(gnumeric_find): Handle crazy values for start.
	(gnumeric_replace, gnumeric_search): Make UTF-8 safe and fix a
	pile of other bugs.
	(gnumeric_fixed): Fix division-by-zero problem.  Handle crazy
	decimals count.
	(gnumeric_substitute): Don't access freed memory.  Always make
	sure to return a string result.  Handle crazy values for num.