[ET Trac] [Einstein Toolkit] #616: Carpet breaks backwards-compatibility with parameter files

[Einstein Toolkit]

#616: Carpet breaks backwards-compatibility with parameter files
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 Reporter:  hinder  |       Owner:  eschnett  
     Type:  defect  |      Status:  new       
 Priority:  major   |   Milestone:  ET_2011_10
Component:  Carpet  |     Version:            
 Keywords:          |  
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 In the mercurial version of Carpet, the parameter Carpet::poison_value has
 been removed.  This breaks any existing parameter files which use this (I
 have a large number).  To avoid unnecessary pain, I propose that the
 parameter be reinstated.  It can print a deprecation warning, and doesn't
 have to do anything.

 I think we should aim to achieve backwards-compatibility with code and
 parameter files as much as possible, especially when it is trivial to do
 so.  The parameter can be removed for good in a later release, if it is
 felt that it clutters up the code too much.  I think there was a CarpetLib
 poison parameter which also changed, but I don't remember what it was.
 This should apply to that one as well.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/616>
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