Patch: make Refluxing infrastructure independent of GRHydro

GRHydro can optionally run with conservative AMR using the "Refluxing" thorn. The infrastructure for refluxing is very generic, but the "Refluxing" thorn currently contains GRHydro-specific code that makes it incompatible with any other solver.

To overcome this limitation, I prepared:

A patched version of the Refluxing thorn, with a generic MoL-like registration mechanism for the fluxes
A new thorn containing all of the old GRHydro-specific code from Refluxing.

The new code passes all existing tests and allow other (M)HD thorns to register variables for refluxing in a very simple way. The code is in two git repositories on bitbucket:

https://bitbucket.org/dradice/refluxing https://bitbucket.org/dradice/grhydro_refluxing

Notes:

GRHydro parfiles that use conservative AMR should be modified to include GRHydro_Refluxing
The new Refluxing thorn no longer supports delayed refluxing, which was never used for any production run, and/or special GRHydro-specific atmosphere hacks.

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