Avoid extra symlinks when not using phasing
Avoid extra symlinks when not using phasing

Phasing use is uncommon so we check for it and avoid an extra step of
symlinks to simplify variant output.

lbeltrame/bcbio-nextgen,biocyberman/bcbio-nextgen,vladsaveliev/bcbio-nextgen,a113n/bcbio-nextgen,a113n/bcbio-nextgen,mjafin/bcbio-nextgen,biocyberman/bcbio-nextgen,mjafin/bcbio-nextgen,lbeltrame/bcbio-nextgen,brainstorm/bcbio-nextgen,brainstorm/bcbio-nextgen,Cyberbio-Lab/bcbio-nextgen,brainstorm/bcbio-nextgen,lbeltrame/bcbio-nextgen,chapmanb/bcbio-nextgen,chapmanb/bcbio-nextgen,vladsaveliev/bcbio-nextgen,mjafin/bcbio-nextgen,a113n/bcbio-nextgen,biocyberman/bcbio-nextgen,Cyberbio-Lab/bcbio-nextgen,Cyberbio-Lab/bcbio-nextgen,vladsaveliev/bcbio-nextgen,chapmanb/bcbio-nextgen