Fixed bug
Added tests
Updated documentation
Merge pull request #1118 from dennishendriksen/master

Fix #1110 Catalog causes deadlocks when removing items from shopping list
Merge pull request #1121 from erwinwinder/master

Updated documentation. Added tests
Fix catalog search bugs #1123 #1124
Merge branch 'master' of https://github.com/molgenis/molgenis