Fixing Issue #216 Python bindings

Podhorszki, Norbertrequested to merge
github/fork/williamfgc/pythonbug into master

Created by: williamfgc

Copy constructor was implicitly removed for ADIOSPy due to m_ADIOS.

PyBind11 needed the copy constructor.

m_ADIOS is now a shared pointer to avoid copy constructor removal

Separated MPI nonMPI test as ctest failed for MPI

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