First commit of the ValueLookupTree class, used to evaluate expressions with
the valueLookup functions.
Merge remote-tracking branch 'upstream/LS1_Upgrade' into valueLookup_tree
Added all the C++ unary math functions.
Changed the value that is returned on failure from -999 to the maximum unsigned
integer.
Added all the binary math functions in C++ to the ValueLookupTree class and
added some error checking.
Added some comments.
Merge remote-tracking branch 'upstream/LS1_Upgrade' into valueLookup_tree
Merge branch 'valueLookup_tree' into LS1_Upgrade