Add a new APS1 marker comparison test.
Add a new APS1 marker comparison test.

The restriction that APS marker locations cannot occur on the first count of a
link list entry makes it so that we must tolerate at least one sample slips in
marker locations for nominally "equivalent" sequences.

calebjordan/PyQLab,rmcgurrin/PyQLab,BBN-Q/PyQLab,Plourde-Research-Lab/PyQLab