Log Right Item, Wrong Context Rehearsal Failures

To further diagnose how the EM noise and WM decay interact, it's
necessary to dissociate WM rehearsal failures that retrieve different
instances of the current target item (right item, wrong context) against
the more detrimental wrong-item, whatever-context failures.

Return extra value in REMplusWM.m updateWMifNeeded and log it in
Trial_Simulator.m
Change default model parameters

This is being done to investigate differences in WM reliability between
the cases of high PI, no EM encoding noise and yes EM encoding noise.
To do this, must standardize parameters being used across both cases.

Modify the values in REMplusWM.m and also
runSimYesDecayYesRehearseYesEMnoise (although this change is looking
forward)