Improve metrics display for validation plot
Improve metrics display for validation plot

Use consistent axes between FNR and FDR for the same variant type
and color variant types to make difference in axes clearer.

Cyberbio-Lab/bcbio-nextgen,vladsaveliev/bcbio-nextgen,guillermo-carrasco/bcbio-nextgen,lpantano/bcbio-nextgen,lbeltrame/bcbio-nextgen,lbeltrame/bcbio-nextgen,biocyberman/bcbio-nextgen,a113n/bcbio-nextgen,lbeltrame/bcbio-nextgen,brainstorm/bcbio-nextgen,lpantano/bcbio-nextgen,brainstorm/bcbio-nextgen,biocyberman/bcbio-nextgen,mjafin/bcbio-nextgen,chapmanb/bcbio-nextgen,Cyberbio-Lab/bcbio-nextgen,guillermo-carrasco/bcbio-nextgen,a113n/bcbio-nextgen,chapmanb/bcbio-nextgen,Cyberbio-Lab/bcbio-nextgen,mjafin/bcbio-nextgen,lpantano/bcbio-nextgen,elkingtonmcb/bcbio-nextgen,vladsaveliev/bcbio-nextgen,vladsaveliev/bcbio-nextgen,biocyberman/bcbio-nextgen,gifford-lab/bcbio-nextgen,gifford-lab/bcbio-nextgen,gifford-lab/bcbio-nextgen,elkingtonmcb/bcbio-nextgen,chapmanb/bcbio-nextgen,brainstorm/bcbio-nextgen,guillermo-carrasco/bcbio-nextgen,a113n/bcbio-nextgen,elkingtonmcb/bcbio-nextgen,mjafin/bcbio-nextgen