OPAL-2114: Fixing navigation on values table with offset/limit
Merge pull request #347 from kazoompa/bug-OPAL-2112

OPAL-2112
Merge pull request #348 from emorency/master

OPAL-2114: Fixing navigation on values table with offset/limit
OPAL-2110: Prevent the cll to updateVariables if the filtering text is empty
OPAL-2114: Not using stringutils...
Merge pull request #349 from emorency/master

OPAL-2110: Do not call _search when filter is empty
Work on OPAL-2020: Cannot modify "default storage" when databases are not editable
Fix failing test
Fix OPAL-2020: Cannot modify "default storage" when databases are not editable
OPAL-2112 - implemented the validation for unique DB urls