DCDI Liver mode: Performing yet another rearrangement of the variables.  Principal part is to have the S= ETS (extracellular transit speed) = 1/EMTT= (Fa+Fv+Ki)/Ve

Goal is the 100x times speed improvement during the Grid-search part of the optimization.  This can be achieved by using the ETS as the top variable of the nested loop. In that case all the exponential tables can
be precalculated once for each value of ETS.  Exponent calculations take about 99% of calculation time.

This is very relevant to plans to calculate the maps for the whole liver.