[RM-6523] Test template orthogonolization using an "optimal" linemodel by setting the bestfit LyaAsym params.

Created on 2021-06-07 13:07:02 by Mira Sarkis. % Done: 0

Template othogonalization depends on the used linemodel which itself depends on some fitted params (e.g., ism, velocity, lyaAsym, tpratio).
In the current version of develop (by 7 june 2021), a "mean" linemodel is used where notably default values being used for lyaAsym parameters (i.e., sigma=2; alpha=0; delta=0).

TODO:
Check the advantage, if any, of using optimal lyaAsym param for each template.