Added comments for upcoming addition of the new material centric xi distributions, which will allow noncongruent input scattering ratios for the two materials in a binary Markov case.  I updated the comments for KL_collect, and commented where changes will be made.  Specifically with that: 'KLresearch', 'KL_collect' update this sub, 'radtransMC' 'MCtransport' use new function for evaluation of scattering ratio and add new function 'KLWood_actscatrat' to module, 'variables' 'KLvars' add 'Coscat' and 'Coabs', 'Loadcase' 'testinputstoc' allow dissimilar scattering ratios.