Small change to allow MakeSitesOnlyVcf retain genotypes for one or more samples.  In this mode all annotations are retained from the full file as if making a sites only file - not recomputed from the retained samples.
Small change to allow MakeSitesOnlyVcf retain genotypes for one or more samples.  In this mode all annotations are retained from the full file as if making a sites only file - not recomputed from the retained samples.

nh13/picard,annkupi/picard,broadinstitute/picard,nh13/picard,broadinstitute/picard,broadinstitute/picard,nh13/picard,alecw/picard,nh13/picard,broadinstitute/picard,alecw/picard,alecw/picard,annkupi/picard,alecw/picard,annkupi/picard,annkupi/picard,broadinstitute/picard