changing unimol reaction to be more general
finished making uni and bi molecular reactions more general. Still need
to know where to place products of uni and bimolecular reactions. And
still need to compile and debug
test
general uni and bi reactions for mols compiles and seems to run ok
added 0 >> species reaction equation
Merge branch 'bz'
used scaled variance for error. thresholds set by ss value at 0.5 +-
range/2