Change didname database to a hash instead of btree. Since we're using a

Change didname database to a hash instead of btree.  Since we're using a
red-black tree within afpd to keep directories in line, this is sort of
redundant.  Also, the compare function seems to be buggy.

This is still a todo item, but as of now, the hash seems to work well, and
increase database resiliency.  This commit obsoletes the didname verify
tool in bin.  I'm going to leave the tool in for now pending further
investigation of this problem.