enchange wms styling * Enable opacity in SLD templates by splitting the corresponding `_fill` value. The place of the change is in the handlers which are specfic to geoserver templates. Adding it there keeps the way how opacity is styled consistent with WFS styles towards the default values in the database and the client.

CREATE TABLE gemma_schema_version (
    version int PRIMARY KEY,
    update_date timestamp with time zone NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE OR REPLACE FUNCTION get_schema_version() RETURNS int
    LANGUAGE plpgsql
    AS $$
    BEGIN
        RETURN ( SELECT max(version) FROM gemma_schema_version );
    END;
$$;