Implement auto-memorization of free stones when close.

Was so confused at first that after standing at the stone that I had not memorized it.

I tried to implement this myself but couldn't find the code responsible for whether you are "close" or not.

I've just committed an Interference class which checks if you're close to another stone to cause your compass to point to it - You could add a config option for auto-memorization distance (if zero, disable auto-memorization) and code the actual automemorization code into the Interference class to save looping through everything again :)

Sounds good, sorry about closing the comment, git's buttons are so attractive sometimes.
just waiting for eclipse to update to Indigo or whatever they are calling it.

Done, thanks :)