GitLab

Adds mesh name (string) parameter to data access methods in the data
adaptor data API. Adds methods to query number of meshes and mesh names
by index to data adaptor metadata API. Updates data adptors, analysis
adaptors, and mini-apps too use the new API.
Co-Authored-By: Brad Whitlock <bjw.ilight@gmail.com>

This patch adds Python bindings to SENSEI.

* Flatten nested namespaces to only 1 level deep
* Update to ADIOS 1.11
* SWIG Python bindings and CMake driver code
* Use interface libraries for dependencies
* export targets and generate a working SENSEIConfig.cmake
* CMake find modules for Libsim, NumPy, and mpi4py
* Newton Python miniapp demonstrating use of SENSEI from Python
* Warning cleanup
* VTKPosthocIO analysis adaptor, writes any VTK dataset to either ".pvd"
  or ".visit" format. Can be used to generate representative data for
  configuring Catalyst and Libsim configs.
* Add a method to the Catalyst adaptor to configure a pipeline from
  Catalyst Python script. Before this was in ConfigurableAnalysis.
* Enable point meshes in the Libsim adaptor
* Update the read me

Needed for int64_t.

We now have a singular "sensei" library providing the "sensei"
namespace.

parallel3d now uses cell-data for passing arrays since they are more
like cells in vtk image data than points.

Refactoring vtkInsituDataAdaptor API to support composite datasets.