Changes to enable sust-only and rand-only expt

	modified:   mcode/expt_config_fmt.example.txt
	modified:   mcode/expt_config_pitch.example.txt
	modified:   mcode/runExperiment.m
Removed unused fields from the config files

	modified:   mcode/expt_config_fmt.example.txt
	modified:   mcode/expt_config_pitch.example.txt
	modified:   mcode/read_parse_expt_config.m
	modified:   mcode/runExperiment.m