Renaming & Simplifying some of the data structures...
renaming/simplification
x
fixed bug in BST. focal node changed to either 'x' or 'node' in classes with xy-coords

tomorrow: bintree
updates, starting on bintree
BinTree find, rangeSearch
insert (untested)
insert tested (minimally)

test insert via main output
all bintree methods appear to be working. about to test output
bintree
flat directory (for autograding)
fixed watcher world vs. bintree coordinates
z