Added handling for getting e-value exponent where e-value is zero.  Also, added source summary generation code.
Added handling for getting e-value exponent where e-value is zero.  Also, added source summary generation code.

MG-RAST/pipeline,wgerlach/pipeline,teharrison/pipeline,teharrison/pipeline,teharrison/pipeline,MG-RAST/pipeline,wgerlach/pipeline,wgerlach/pipeline,MG-RAST/pipeline