[ET Trac] [Einstein Toolkit] #1811: simplify CarpetLib's data.cc file

[Einstein Toolkit]

#1811: simplify CarpetLib's data.cc file
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 Reporter:  rhaas     |       Owner:  eschnett           
     Type:  task      |      Status:  new                
 Priority:  optional  |   Milestone:                     
Component:  Carpet    |     Version:  development version
 Keywords:            |  
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 CarpetLib's data.cc file contains a number of very large and complex
 switch statements inside of its {{{transfer_prolongate}}} and
 {{{transfer_restrict}}} routines (the prolongate one is about 500 lines
 long and is only one half of an {{{#if CAPRET_DIM}}} preprocessor if
 statement). The two switch statements also have to be kept in sync with
 each other whenever a new transport operator is added.

 It may be good to instead define some type of "operator package" object
 that contains the list of prolongation, restrict, time interpolation
 operators that correspond to a particular choice of transport operator and
 refinement centering as chosen in the parameter file and interface.ccl.

 This way the complex logic could be collected in only a single place. This
 would be useful since we seem to plan to add more new transport operators
 to Carpet.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1811>
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