[RM-7039] mode for generating template line ratios

Created on 2022-02-03 11:48:05 by Didier Vibert. % Done: 0

decide if it is via linemeas or a dedicated mode of linemodel.
will also need a conversion tool to go from amazed outputs (hdf5) through new lineratios format.

linked to a mode to generate priors ie statistics on all the parameters but redshift.

common aspects to all: no zrange (only one z given as input), no zpdf, nor zcandidates at the end.

• diff between linemeas & gen template lineratios:

• velocity fit (may be needed in linemeas)

• diff between linemeas & gen priors stat

• need for continuum template fitting (full model) instead of polynomial fit