Users can define `label_colors` in a dashboard's JSON metadata that
enforces a label to color mapping.
This also makes the function that maps labels to colors case insensitive.
In `assets/static` we have a symlink pointing to `docs/_build/html`
which is .gitignored and missing in the repo since we don't want the
html-generated docs in the repo, meaning the symlink is broken
Having the symlink broken creates issues with pip-compile somehow.
Adding a dummy file here addresses that
* feat(visualization): Create new visualization's tools that display country with geojson file. Currently only france and Spain are loaded
* refacto(visualization): fix issues created by codeclimate
* refacto(visualization): fix issues created by travis for mysql databases
* refacto(visualization): fix issues created by codeclimate
* refacto(visualization): fix issues created by codeclimate
* refacto(visualization): fix issues created by codeclimate
* refacto(visualization): fix issues created by codeclimate
* fix(visualization): fix issues
* doc(visualization): Init visualization documentation
* doc(visualization): init visualization documentation for country
* fix(visualization): implement iso 3166-2 for id of country
* fix(visualization): implement iso 3166-2 for id of country
* doc(visualization): init visualization documentation for country
* fix(visualization): implement iso 3166-2 for id of country
* feat(country_map): add ukraine map in component
* fix(visualization): Test dont working and add color based on metrics
* refacto(visualization): fix issues for es6 and color component
* db_engine_specs: added engine spec for clickhouse
* models: group by time without join on subquery
if this is enabled, it will remove the subquery when grouping by time,
and group by time will be rewritten as group by timeslot, ...
this particularly fixes clickhouse backend
* docs: added clickhouse
* models: allow using secondary dttm columns as constraints
* superset/forms: configurable default slice since time
* superset/models: respect dialect quoting
* dttm handling, codeclimate tweaks
When adding a Redshift database, the docs said to use a connection
string that started with `redshift+psycopg2://...`, but this results
in a Python error from how SQLAlchemy executes the `get_schema_names`
method (first reported [here](https://github.com/airbnb/superset/issues/2364#issuecomment-284705179)).
The fix is to use `postgresql+psycog2://...` for the Redshift connection
string.
