Export smtk python path for downstream libraries

Now smtk exports a CMake variable named SMTK_PYTHONPATH which is the the path
to smtk python.
10 jobs for !1846 with export-smtk-python-path in 33 minutes and 37 seconds (queued for 7 seconds)
detached
Status Name Job ID Coverage
  Build
passed build:fedora31 #4700825
build cmb docker linux

00:03:41

passed build:fedora31-coverage #4700828
build cmb docker linux

00:18:16

passed build:fedora31-paraview #4700827
build cmb docker linux

00:04:47

passed build:fedora31-vtk #4700826
build cmb docker linux

00:02:25

 
  Test
passed test:fedora31 #4700829
build cmb docker linux

00:01:23

passed test:fedora31-coverage #4700832
cmb docker linux x11

00:02:39

passed test:fedora31-paraview #4700831
cmb docker linux x11

00:01:12

passed test:fedora31-vtk #4700830
cmb docker linux x11

00:01:07

 
  Analyze
passed analyze:fedora31-coverage #4700833
build cmb docker linux

00:01:48

49.17%
 
  External
passed ghostflow-branch-check-master