Merge branch 'fix_10' into 'master'

Fix 10 - make pymca process from a thread

Closes #10

See merge request !8
3 jobs for master in 4 minutes and 16 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #41744
test:python3.5-stretch-pyqt5

00:04:10

passed #41745
test:python3.5-stretch-pyside2

00:04:09

passed #41746
test:test-xas-tutorials

00:04:16