Removed a bunch of back-up files
	deleted:    mcode/UIRecorder_bak1.m
	deleted:    mcode/getTSMDefaultParams_bak20130215.m
	deleted:    mcode/runExperiment_bak20130215.m
	modified:   mcode/updateTrialList.m
Changed micRMS_100dBA to a config field

instead of being a "global" variable stored in a .mat file.

Note that micRMS_100dBA is now different between behav and fMRI
experiments, for behav, micRMS_100dBA = 0.5 (same as before), but for
fMRI, micRMS_100dBA = 0.2 (to prevent clipping).