Removed mdds as the backend because segment tree has to be rebuilt after new inserts.
Changed dev folder and removed mdds test script.
Using Emin Martinian's interval tree implementation as new backend.  web.mit.edu/~emin/www.old/source_code/cpp_trees/index.html
Added new dummy interface for 2D interval tree.
Fixed incorrect signature for TwoD_IT_w_TopK::topK.
More changes to TwoD_IT_w_TopK public interface.
Reverted TwoD_Interval storage type to int to prevent return type conflict with virtual functions definitions in Interval.
Various bug fixes in Emin's package, these were likely caused by changes in the C++ language standard since the code was written.