Merge branch 'checking-zpp-solvers' into 'rc3.1'

Checking zpp solvers

See merge request !10
20 jobs for morph-gui-1.5 in 39 minutes and 29 seconds (queued for 9 seconds)
Name Stage Failure
failed
build:dlms-agent Build
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
Running after_script
/bin/bash: line 158: docker: command not found
Running after script...
$ echo '=========================================================================='
==========================================================================
$ docker image ls
Cleaning up file based variables
ERROR: Job failed: exit code 1