Merge branch 'master' into currency-metadata

.circleci/config.yml

docs/administration-guide/databases/oracle.md

docs/administration-guide/images/oracle_jdbc_download.png

frontend/src/metabase/components/Header.jsx

frontend/src/metabase/css/dashboard.css

...end/src/metabase/dashboard/components/DashboardHeader.jsx

...etabase/dashboard/components/RemoveFromDashboardModal.jsx

.../metabase/visualizations/components/ChartClickActions.jsx

src/metabase/automagic_dashboards/comparison.clj

src/metabase/driver/googleanalytics/query_processor.clj

src/metabase/mbql/normalize.clj

src/metabase/mbql/schema.clj

src/metabase/mbql/schema/helpers.clj

src/metabase/mbql/util.clj

src/metabase/models/dimension.clj

src/metabase/query_processor.clj

src/metabase/query_processor/interface.clj

.../query_processor/middleware/add_dimension_projections.clj

...abase/query_processor/middleware/add_implicit_clauses.clj

...y_processor/middleware/auto_bucket_datetime_breakouts.clj