[ET Trac] [Einstein Toolkit] #1384: simplify using Refluxing with MoL

[Einstein Toolkit]

#1384: simplify using Refluxing with MoL
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 Reporter:  rhaas        |       Owner:                     
     Type:  enhancement  |      Status:  new                
 Priority:  optional     |   Milestone:                     
Component:  Other        |     Version:  development version
 Keywords:  Refluxing    |  
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 currently one needs to set two parameters when using Refluxing with
 GRHydro only: nvars and nvars_evolved which are set to the same value. The
 two different parameters allow refluxing to be used with thorns that
 implement their own timestepping indedpendent of MoL.

 To simplify usage in situations where only MoL is used I proposed to
 introduce a new parameter nvars_not_evolved_with_MoL which defaults to
 zero and to retire nvars_evolved in favor of the new parameter. This would
 make MoL based simulations with only a single parameter choice possible.
 Alternatively we could have a second string non_MoL_refluxing_variables
 that lists the variables which have refluxing applied to them but are not
 evolved with MoL.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1384>
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