[ET Trac] [Einstein Toolkit] #1852: MoL: Add "RK2-central" scheme

[Einstein Toolkit]

#1852: MoL: Add "RK2-central" scheme
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 Reporter:  eschnett               |       Owner:                     
     Type:  enhancement            |      Status:  new                
 Priority:  minor                  |   Milestone:                     
Component:  EinsteinToolkit thorn  |     Version:  development version
 Keywords:                         |  
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 This is an RK2 integrator where the first substep has size dt/2.

 See <https://bitbucket.org/cactuscode/cactusnumerical/pull-requests/6/mol-
 add-rk2-central-scheme/diff>.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1852>
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