Issue 614: Module & Finalizer: the module finalizer

[timspainNERSC]

Module & Finalizer: the module finalizer

Fixes #614 (partially)

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Change Description

• Adds the Finalize class, which mimics std::atexit(), but can be called before the end of main().
• Adds the Finalizer.cpp source file to the CMake system.
• Adds a test of the Finalizer class.
• Adds a Module::finalize<> function template.
• Adds the instantiation of the above function template to the module generation file.
• Add registration of finalization for a module wherever the module implementation if configured.
  • By calling registerUnique() each module instantiation is only called once when the finalization occurs.

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Test Description

There is a test for the new Finalizer class.