* Tried a "Find" method to reduce repeated code between MxAtomId::Destroy and TreeAdd functions
* Renamed the "Successor" function
* There is a destructor for the RB tree. I started on one of the companion functions but it is unfinished here.
* I think the left/right rotates are correct now. Eventually I will rename the members from m_child0/m_child1 to right/left but that ought to be its own commit.
* MxAtomId operator= match
* Added some more comments as I try to work all this stuff out.
