Fix unused variable warning
Fixes for unused variable warnings
"Always fail" is not a good test

Not sure how I made this error.
Bug fix in reading!!

Kinetics model was read after reaction object instantiated
Almost all done
Reading part updated for photochemistry, dealing with A not
necessarily existent
merge for the bug fix
Merge branch 'master' of https://github.com/libantioch/antioch into photochemistry
All done now, the physical flux is parameterized in its corner,
a pointer is used to known its state (updated or not), and
the update routine is at the reaction_set level, automatically done
in the kinetics_evaluator object.

The idea is to check the pointer, and calculate the rate constant if
need be.