when dealing with electron transfer surface reactions.
This way specifies an exchange current density reaction rate coefficient
in units of amps / m2. This is slightly more informative for
electrode reactions.
The new also preserves the correct treatment of activity coefficients
for these reactions.
A memo describing this new capability is in the works.
There were two changes:
Additions to support some reversible reactions which have fractional
stoichiometries. These were not allowed previously. However, if
the species with fractional stoichiometries are in single-species
phases, this is ok, and actually necessary for some solid-phase
reactions.
Removed comments from DEBUG_MODE about about too high or low an activation
for electrode reactions.
