[ET Trac] #2701: Use `std::shared_ptr` in Piraha

[Erik Schnetter]

#2701: Use `std::shared_ptr` in Piraha

 Reporter: Erik Schnetter
   Status: new
Milestone: 
  Version: 
     Type: enhancement
 Priority: major
Component: Cactus

Replace the self-implemented `smart_ptr` with `std::shared_ptr` . This does not change any behaviour, but simplifies the code.

See [https://bitbucket.org/cactuscode/cactus/pull-requests/149](https://bitbucket.org/cactuscode/cactus/pull-requests/149) .

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2701/use-std-shared_ptr-in-piraha
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