Function to imitate Affymetrix' gtype\_cel\_to\_pq software.
function is design to be used with
on an Affymetrix Mapping (SNP) CDF
list structure with a single group. The fields in this
groups are in turn vectors (all of equal length) where the elements
are stored as subsequent quartets (PMA, MMA, PMB, MMB) with all
forward-strand quartets first followed by all reverse-strand quartets.
 Affymetrix, Understanding Genotyping Probe Set Structure, 2005.
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