GEOT-4813: added pagination and order preservation options for UniqueVisitor, also added JDBCDataStore optimized implementation for those
GEOT-4813: restored applyLimitOffset with alternative signature to avoid building issue in app-schema
GEOT-4813: added new flag to jdbc dialects to enable sort support on aggregation functions only for some jdbc modules, enabled postgis and oracle for the moment
Merge pull request #470 from mbarto/geot_4813_uniquevisitor

GEOT-4813: added pagination and order preservation options for UniqueVisitor