Merge pull request #1 from zotya/master

Data persistence for sparql results & quick preview for queries
Refs #9608; Fixed preview for queries returning empty fields
Fixed pylints
Refs #9558 - Prepare sparql daviz.json for annotations
Merge branch 'master' of https://github.com/collective/eea.sparql
Refs #9558 - Handle data annotations by sparql queries
[JENKINS] - Fix tests
Refs #9424; Fixed tests for eea.sparql