Fix equality field value building
Fix getter in DataValueTable
Add snak store for qualifiers
Merge branch 'master' of github.com:wmde/WikibaseQueryEngine
Add propert exception handling to QueryStoreInstaller
Add propert exception handling to QueryStoreUninstaller
Merge branch 'master' of github.com:wmde/WikibaseQueryEngine
Merge pull request #17 from JeroenDeDauw/master

Various fixes