Improved time calculation (excluding sub-functions) and differentiation by caller

[TyrionWarMage]

Major: time is now excluding sub-function call times list now differentiated by parent function

Minor: added sum, as measured sum of function calls added init, as time spend initiating added delta to sum/total/init added Market to observed classed

[ezolenko]

This uses way too much memory unfortunately.

[gdborton]

Hmmm, I'm not sure that I like removing the sub calls by default. This'll definitely impact current users. I wonder if that could be optioned via a top-down vs bottom-up flag.