Two group genome clusters

Observed clustering now based on the genome.  Avoided by simply not
simulating genomes starting with a 1 (pg. 16 of lab notebook).
Skipping genomes starting with 1

Skipping genomes starting with a 1
Changed source strength to reflect linear fit

The soruce strength was modified by the linear fit in order to have a
better agreement between the MCNPX model and the XSDRN model.  However,
the scaling doesn't really matter, as long as the rankings are the same
(i.e. order is preseved in terms of sorting by interaction rate)