peddy: enable tools_off configuration, catch new PCA error
peddy: enable tools_off configuration, catch new PCA error

- Turns off peddy for tools_off both for single sample and batch runs.
- Correctly catches new syntax for PCA errors with few features/variants.

vladsaveliev/bcbio-nextgen,vladsaveliev/bcbio-nextgen,lbeltrame/bcbio-nextgen,a113n/bcbio-nextgen,a113n/bcbio-nextgen,chapmanb/bcbio-nextgen,vladsaveliev/bcbio-nextgen,lbeltrame/bcbio-nextgen,chapmanb/bcbio-nextgen,chapmanb/bcbio-nextgen,lbeltrame/bcbio-nextgen,a113n/bcbio-nextgen