Added .gitignore and SfLib.
Added first version of AvlTree and Makefile for easy compile.
Fixed min/maxkey. Make height and hbal Fixpoint/Definition.
Make height definition correct. Fix typo in bst. Add test examples.
Proved size < 2^(height+1).
new stuff for project - not clean
proved BST after rotation using unproved lemmas.
completed proof of BST after right rotation, but uses unproved lemmas
proved that it is BST after insertion
put Hint Constructors for auto.
proved that it is BST after rebalancing and fix typos in btrebal
proved that key can be found after BST insertion
proved correctness of BST search
rename bthaskey to haskey (so it's consistent with min/maxkey)
moved bst search to top
almost proved correctness of BST insert
completed proof of correctness of BST insert, and proved determinism
fixed bstins_correct theorem statement
defined BST deletion and proved nondeterminism
rename bsthaskey to bstsearch and bstinsleft/right to bstinsl/r