[ET Trac] [Einstein Toolkit] #839: MoL Multirate capabilities. This add three new multirate RK schemes to MoL.

[Einstein Toolkit]

#839: MoL Multirate capabilities. This add three new multirate RK schemes to MoL.
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 Reporter:  reisswig@…                  |        Type:  enhancement  
   Status:  new                         |    Priority:  optional     
Milestone:                              |   Component:  Cactus       
  Version:                              |    Keywords:  MoL Multirate
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 In order to make multirate work, we need to introduce new registration
 routines that explicitly register variables with the "slow" sector, i.e.
 those variables which are integrated by the lower order scheme.
 This also means that we require new "accumulator" parameters indicating
 how many "slow" variables we want to register.

 Flags indicate whether it is time to execute slow RHS computation.
 For instance, in the RK4-RK2 scheme, there are 4 substeps in total, but
 the RK2 RHS are only evaluated in the very first and in the very last step
 of the four substeps.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/839>
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