GitLab

fix the remaining CI issues.

Also make sure .ncrst files are copied over in the test directory.

really used CMake in-depth before).

Hopefully this fixes the Travis-CI build failures.

Install SWIG interface definition to the include directory, so outside plugins can use it when building their Python APIs

Use Doxygen to generate API docs for Python.  This involved lots of changes both to Python API generation and to Doxygen doc generation.