Adding memory statistics

[sumedhghaisas]

While comparing time taken by a benchmark case, its memory comsumption can also be computed by overloading new and delete operators. But this overloading is not that simple and not reccommended either, so lot of thinking has to be done.
Also does this overloading creates a runtime overhead? If it does time and memory has to be benchmarked in different executions. In the memory computation run the overloaded operators can be
dynamically loaded with .so files.