Use days/hours/minutes/seconds instead of seconds in the DURATION field.
It fixes interaction with other softwares like phpicalendar.
Lukas: Remove use of dur-week. RFC 5545 states that you cannot use this
in conjunction with dur-day. Also, fix formatting and use proper
constants.
Signed-off-by: Jerome Pinot <ngc891@gmail.com>
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>
