[Users] Patch: add hydro variables support for the CactusNumerical/Noise thorn

Dear all,

in order to use the CactusNumerical/Noise thorn to perform a stress test on the hydro equations "id_noise" has to be properly scheduled with respect to HydroBase_Initial and HydroBase_Prim2ConInitial. As it is now numerical perturbation on the hydro variables could be discarded / overwritten.

The attached (trivial) patch fixes the above mentioned issue and includes some small aesthetic fixes. Could you please consider applying it to the development branch of the Einstein Toolkit?

Thanks, David

PS: note that the hydro thorn has to schedule Prim2Con in HydroBase_Prim2ConInitial otherwise the perturbation are simply ignored/overwritten.