Added field next to planning_time for planning_attempts
Now, ParallelPlanner terminates either due to timeout, or due to this many attempts.
Note, that ParallelPlanner run's Dijkstra's on all the nodes of all the sucessful plans (hybridize==true).
moved planning_attempts down one row in gui to maintain gui width
Merge pull request #457 from drchrislewis/fix_456

Added field next to planning_time for planning_attempts