Update 10.14.2013 0948

studies/speed_test:		Added a studies to compare speeds of interpolation algorithms
data_grid_fast_2d.h:	Modified to increase speed. Moved malloc's to main constructor
						so that they are only called once per instance.
CMakeLists.txt:			Updated to allow for using Cachegrind/Callgrind (-pg tag)
datagrid_test.cc:		Modified slightly