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.