Correctly parse all types of iCal durations

This was supposed to be fixed in 6ca2535 (ical.c: Simplify and fix
ical_durtime2long(), 2014-07-28) but some cases were not covered.

Reported-by: Håkan Jerning <jerning@home.se>
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

test/ical-006.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+
+. "${TEST_INIT:-./test-init.sh}"
+
+if [ "$1" = 'actual' ]; then
+  mkdir .calcurse || exit 1
+  cp "$DATA_DIR/conf" .calcurse || exit 1
+  "$CALCURSE" -D "$PWD/.calcurse" -i "$DATA_DIR/ical-006.ical"
+  "$CALCURSE" -D "$PWD/.calcurse" -s06/01/2012 -r2
+  rm -rf .calcurse || exit 1
+elif [ "$1" = 'expected' ]; then
+  cat <<EOD
+Import process report: 0078 lines read
+12 apps / 0 events / 0 todos / 0 skipped
+06/01/12:
+ - 15:00 -> 20:00
+	5 hours
+ - 15:00 -> 20:00
+	5 hours
+ - 15:00 -> 20:00
+	5 hours
+ - 15:00 -> 20:00
+	5 hours
+ - 15:00 -> 15:30
+	30 minutes
+ - 15:00 -> 15:30
+	30 minutes
+ - 15:00 -> 15:30
+	30 minutes
+ - 15:00 -> 15:30
+	30 minutes
+ - 15:00 -> 20:30
+	5 hours and 30 minutes
+ - 15:00 -> 20:30
+	5 hours and 30 minutes
+ - 15:00 -> 20:00
+	5 hours and 10 seconds
+ - 15:00 -> 20:30
+	5 hours, 30 minutes and 10 seconds
+EOD
+else
+  ./run-test "$0"
+fi