Doxygen documentation for cstream.h
Set implementation
Doxygen documentation for set.h
Add element comparator function

This allows the elements in the set to be sorted if they are non fundamental data types.
Add debug option to print memory leaks

Run 'nmake DEBUG="/D_DEBUG /MTd" run' from the command line. Note: need to run 'nmake clean' between debug and non-debug compilation since it doesn't recompile based on the debug flags.
List implementation
Add element comparator function for List
Doxygen documentation for list.h