[ET Trac] [Einstein Toolkit] #1003: Add optional support for CarpetEvolutionMask to GRHydro

[Einstein Toolkit]

#1003: Add optional support for CarpetEvolutionMask to GRHydro
-----------------------------------+----------------------------------------
 Reporter:  rhaas                  |       Owner:     
     Type:  enhancement            |      Status:  new
 Priority:  minor                  |   Milestone:     
Component:  EinsteinToolkit thorn  |     Version:     
 Keywords:  GRHydro                |  
-----------------------------------+----------------------------------------
 the attached patch adds access to CarpetEvolutionMask's evolution mask to
 GRHydro. CarpetEvolutionMaks tracks which points on each level contribute
 to the final answer, roughly speaking anything that would show up in a
 call to the interpolators.

 The functional change to GRHydro is trivial (just a parameter, a GF access
 and a cycle in the routine that checks for C2P failures). However getting
 the equivalent of CCTK_VarDataPtr to work in Fortran turned out to be
 ugly. Better solutions are very welcome. Desired features are:

 * easy to use
 * not error prone
 * allows to run GRHydro without CarpetEvolutionMask (this means inheriting
 won't work)
 * low memory footprint

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/1003>
Einstein Toolkit <http://einsteintoolkit.org>
The Einstein Toolkit