[ET Trac] [Einstein Toolkit] #1627: Merge rewrite branch of McLachlan

[Einstein Toolkit]

#1627: Merge rewrite branch of McLachlan
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 Reporter:  eschnett               |       Owner:                     
     Type:  enhancement            |      Status:  new                
 Priority:  major                  |   Milestone:                     
Component:  EinsteinToolkit thorn  |     Version:  development version
 Keywords:                         |  
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 We should merge the "rewrite" branch of McLachlan.

 To do before this merge:
 - Remove helper thorn
 - Add backward compatibility layer for parameters

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1627>
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