Fixed error in bid_bax_fret model rule

I mistakenly had the conf "mem" in the dissociation/product production
rules (instead of "ins"), which would lead to all kinds of weirdness. I
have also changed the scaling parameters to be uniform distributions
with strict bounds.
File for manually expting with params for Bid/Bax FRET
Some additional plots after running MCMC
New models for Bid/Bax FRET