add Hash(), IsSortable() and CompareTo() so paramters can be stored in hash and sorted lists.
add Hash(), IsSortable() and CompareTo() so paramters can be stored in hash
and sorted lists.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@40272 27541ba8-7e3a-0410-8455-c3a389f83636

bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical