Added more doxygen comments to the files. Added a catch/throw block to setstate_TPX().
Added more doxygen comments to the files.
Added a catch/throw block to setstate_TPX().

imitrichev/cantera,Heathckliff/cantera,imitrichev/cantera,imitrichev/cantera,imitrichev/cantera,imitrichev/cantera,Heathckliff/cantera,Heathckliff/cantera,imitrichev/cantera,Heathckliff/cantera,Heathckliff/cantera,Heathckliff/cantera