Data for 140514 Bax 43C DPX requenching
Changed fmax_by_well to take final_q instead of ka/kd

This allows the final quenching value (at the highest concentration) to
be computed using the fit function or by a lookup based on the original
datapoints in the standard curve.
Moved q_outs calculation outside of requenching_analysis

This way the predicted quenching values can be calculated using the
fitting function or by looking up the values from the quenching_dict.
Changed semantics of final_q and q_outs

So that now the represent the quenching in the sense of q_out, ranging
from 0 to 1, where 1 is no quenching and 0 is full quenching. Previously
there was confusion whether they represented I_0/I or the quenching
value.
Initial plotting code for 140514 Bax 43C DPX epxt