Change checking for Null to an "isNull" method, so subclasses could implement their own Null objects
Add generic rotateLeft and rotateRight methods
Old tree implementations removed
Simple check to see that random side Hibbard deletion tends to keep things more balanced.
First steps in Red-Black trees
Move key extraction as late as possible.
Improved RBTs
Added test for balance
Move graphs methods to subfolder, placeholder files for moving algorithms out of base class.
Added isHeap and size functions
Allow missing isLess for simple types
Various fixes
Tests for Heaps
Renaming of placeholder file for Floyd Warshall algorithm
Various graph method additions