Interaction between MRCA prior and clock models in one place

[richelbilderbeek]

Feedback bjoelle

I found it confusing that the code relative to the interaction of MRCA priors and clock models is in a different place for strict and relaxed clocks, and it seems to have led to different behaviour between the 2 clocks (see comments in Functionality section). I would recommend putting everything in the mrca_prior_to_xml functions.

[richelbilderbeek]

I agree that that would be nice. As there is no higher-level architecture and testing is done by reproducing files, all I can do is wiggle in those MRCA lines at the places needed.

Dicussion about architecture is here: #38

Closing this Issue, as I do agree.