EZP-21908: add Content info to hide and unhide Location signal
EZP-21908: implement Solr slots for hide and unhide of Location
EZP-21908: add multiple boolean field to Solr schema
EZP-21908: implement Visibility criterion visitor
EZP-21908: index Content visibility data
EZP-21908: add integration test for search with Visibility criterion
Merge pull request #597 from ezsystems/fix-EZP-21908-visibility-criterion-visitor

Fix EZP-21908: Implement Visibility Criterion visitor for Solr Storage