Merge branch 'release_v2.1.0' into 'master'

Release v2.1.0

See merge request !435

CI/create_version_badge.sh

 #!/bin/bash
 
-VERSION="$(git describe master)"
+VERSION="$(git describe --match v[0-9]*.[0-9]*.[0-9]* --abbrev=0)"
 COLOR="blue"
 BADGE_NAME="version"