Cli: clear the vm map
Kraken: add stop_point destination to best_dest
Kraken: forbid to mark destination stop points
Kraken: add transfer time in label

There was a problem, sometime we were over-writing intersting
arrival_time to destination with transfers.
Kraken: add test on destination_overwriting
Kraken: improve kraken init
Merge pull request #478 from l-vincent-l/NAVITIAII-1051

Add transfer arrival_time