Initial work on a free algorithms reference.


git-svn-id: svn://svn.tartarus.org/sgt@1068 cda61777-01e9-0310-a592-d414129be87e
B-tree algorithms complete, including log-time splitting and joining
and counted B-trees. Whee!


git-svn-id: svn://svn.tartarus.org/sgt@1075 cda61777-01e9-0310-a592-d414129be87e