#2043: new thorn for initial data (Hydro_RNS)

Comment (by Roland Haas):

Compared to what is in the ET as of git hash dfd2be34 "ReadInterpolate: documnetation fixes" of einsteininitialdata the differences in Hydro_RNS (git hash cef42e5 "Capitalisation Error" of [](https://bitbucket.org/GravityPR/prthorns/src/master/Hydro_RNSID/) ) seem to be that the latter supports a perturbation. Using instead git hash f788d35 "Allign to ET version" of [](https://bitbucket.org/GravityPR/prthorns/src/master/Hydro_RNSID/)) they are identical up to some text formatting and GRHydro support.

This ticket should be closed.