Modified how samples designated as Mock are treated during the analysis
Mock samples can now be indicated by "None" or "Control" as well
(case-insensitive)
Abundance can now be selected as [Read], [UMI], or [Fragment]{default} within
config parameters and this selection will identify the abundance method used
for analysis
Added support for alternative UMI method (dx.doi.org/10.17504/protocols.io.wikfccw)