latest changes to FIGSimavr project...

moved fast core local into project to serve as an example of fast core local use, modified makefiles.
minor changes to the fast core to support piggybacking and gloabl.
simple calibration code based on (i86) rdtsc, applicable to other processors with similar features.
modifications to pthread and loop code.
more accurate counts and estimated simulated avr running frequency.

	modified:   Makefile.common
	modified:   examples/board_fignition/FIGsimavr.c
	modified:   examples/board_fignition/Makefile
	modified:   simavr/Makefile
	deleted:    simavr/sim/sim_fast_core.c