Extend import of recurrence rules

Support has been implemented for recurrence rule parts BYMONTH, BYMONTHDAY and
BYDAY.  A new test has been added.

Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

src/utils.c

@@ -434,9 +434,9 @@ time_t tzdate2sec(struct date day, unsigned hour, unsigned min, char *tznew)
 	tzold = getenv("TZ");
 	if (tzold)
 		tzold = mem_strdup(tzold);
-
 	setenv("TZ", tznew, 1);
 	tzset();
+
 	t = date2sec(day, hour, min);
 
 	if (tzold) {