Use a 2-pass approach to generate ADIOS2.config.  The first pass
generates the configurable options in the header and the second pass
configures them.  This allows for consistency in the options used and
thier ordering with respect to where they're used elsewhere.

Fixes #279

added VDS support via Engine (HDF5Mixer)

added Read() to Transport class

Add upstream FindMPI

Finished DataMan Transport Manager refactoring but full functionality still pending on Read API

Update pybind11

CI Fixes: master build name + test configuration type

* upstream-pybind11:
  pybind11 2017-09-14 (86e2ad4f)

PyBind11 Upstream authored 7 years ago and Atkins, Charles Vernon committed 7 years ago

Code extracted from:

    https://github.com/pybind/pybind11.git

at commit 86e2ad4f77442c3350f9a2476650da6bee253c52 (v2.2.1).

TESTING: Make binding tests able to run in parallel

Redesign the logic for C binding test with google framework.
In the future we should also add validation for binding tests.

Get AppVeyor builds working