Merge remote-tracking branch 'devel/add_paraview_plot_tests'

* devel/add_paraview_plot_tests:
  add tests for paraview contour and slice plots
Merge remote-tracking branch 'devel/add_mac_regression_test'

* devel/add_mac_regression_test:
  add regression test image for mac dashboards
Set INCLUDE_PYTHONHOME_PATHS to OFF for UV-CDAT ParaView build
Merge remote-tracking branch 'devel/uvcdat_but_112_update_paraview_external' into devel-master

* devel/uvcdat_but_112_update_paraview_external:
  Set INCLUDE_PYTHONHOME_PATHS to OFF for UV-CDAT ParaView build