Change Group

Changes group details for group with specified group id.

• user
• pwd (md5 hash of the password)
• grpid
• groupName
• dateInit (this should be formated YYYYMMDD)
• dateEnd (both the start and end date refer to hour 0, so if a comp has it's last day on the 2017-02-25, it dateEnd should be set to 20170226, i.e. 2017-02-26 00:00:00)
• utcOffset (number of seconds from UTC)
• isPublic the group is publicly visible
• isComp the group is a competition
• taskSender the group task sender identity (optional)
• delete (optional, if set to 1 will delete the group, only grpid is necessary)