Merge branch 'numcores' into 'master'

Allow to set number of processes

Closes #53

See merge request !78
6 jobs from master in 6 minutes and 4 seconds (queued for 5 minutes and 55 seconds)
Status Job ID Name Coverage
  Build
passed #13713
build_python2

00:01:12

passed #13714
build_python3

00:01:12

 
  Test
passed #13715
test_python2

00:01:34

passed #13716
test_python3

00:01:52

 
  Deploy
passed #13717
pages

00:00:12

passed pages:deploy

00:00:00