Updated Graph

I updated my AStar code, and it's in a separate folder now, as a sort of
version control.  I still can't get the parallelized code to work
properly... I'm thinking now that when one thread finds a node that both
have searched, it sends a global message out to STOP searching, and then
both threads will send back their 'paths so far', and then they will be
attached to one another from the main thread.  I'm trying... it's not
working... more to do tomorrow!  I also have now made it so that we use
a Vector3D class (3 DIMENSIONS) rather than 2D to account for height
data.