Basic comparison operators, along with clone()
Further tests
Progress towards basic STL iterator wrappers.

Super dangerous at present, and exported only for std::vector<double>
Simplify module code generation.

Done through some ugly macros for now, but can be tweaked later.
Valgrind support for tests
Notes on iterator validity.
Barebones "find" support for iterators (only one type supported)
Slightly nicer S4 wrapping around the find() method (as locate).
Tidy up find (and framework for other algorithm inclusions).
Name tree tests more meaninfully
Work around odd Rcpp garbage collection issue (?)
Basic iterator support for the tree.
Move iterator testing code into its own file