nightMiner with early blockade and collision avoidance improvements

Early blockade has been enabled in order to give a chance at testing how things go when we block all of the routes into someone else's shipyard. It seemed to be causing a decrease in scoring potential.

Collision avoidance has been improved in most routines; there still seems to be a buggy implementation of it at some point, however, as collisions still (though infrequently) take place.

nightMiner now with blockade capability

Everything the previous one had, except ships are now freeing the drop zone by stampeding other players shipyards to clog them up and/or destroy their ships.

nightMiner non-wandering miner

Finally starting up with tagging and releasing the versions of the miner that I'm going to submit to the contest itself.

This particular version has initial scuttling working, dropoffs are working, and the wandering whilst mining issue has been fixed. There is still a major issue with navigation allowing 'pawn blockades' (see issue #33) to form, which take the ships out of play indefinitely. So long as there are more than 3 or 4 ships, it always causes a clusterfsck at the race to the shipyard at the end. :( Guess what's next on the agenda?