[ET Trac] [Einstein Toolkit] #2208: Fix small memory leak in Piraha

[Einstein Toolkit]

#2208: Fix small memory leak in Piraha
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  Reporter:  Steven R. Brandt  |      Owner:  (none)
      Type:  defect            |     Status:  new
  Priority:  minor             |  Milestone:  ET_2019_02
 Component:  Cactus            |    Version:  development version
Resolution:                    |   Keywords:
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Comment (by Roland Haas):

 Steve and Roland discussed this in person at SC18. Roland asks to have the
 prototype of the constructor changed to take a bare pointer rather than a
 smart-pointer to make it more obvious for callers of the Lookup objects
 that they store a bare pointer to the their grammar.

 The current logic in piraha should be such that the grammar object exists
 for as long as the lookup objects exist so the pointer should not become
 dangling.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/2208#comment:1>
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