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Create Python memoryview objects for VolumeDataPage GetBuffer/GetWritableBuffer methods

Morten Ofstad requested to merge feature/morten.ofstad/VolumeDataPageMemoryView into master

This adds API to create memoryview objects for the VolumeDataPages so it is possible to write data to a VDS using Python.

  • Add API to get the VolumeDataPageAccessor from a VolumeDataPage.
  • Make sure we include our own pybind11 version before anything installed on the system.
  • Avoid releasing the GIL when using py::cast.
  • Create Python memoryview objects for VolumeDataPage GetBuffer/GetWritableBuffer methods.
  • Add 'unitless' to the KnownUnitNames.
  • Add more code to the Python createtest so it writes to the VDS and checks if the result is correct.

This resolves #73 (closed) "Python VDS creation doesn't work".

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