Fixed bemgr issue #1: bemgr create did not work in time zones that weren't west of UTC, because the UTC offset was put in the snapshot name, and while - is legal in a snapshot name, + is not (e.g. in April, America/Denver would have the offset -06:00, whereas Europe/Paris would have the offset +02:00). The offset is now omitted from the snapshot names, since the snapshot names just need to be unique, and bemgr list will show their creation time in the local time zone regardless of what the time zone was when the snapshot was created.