[#47] Billing: Add penalty per business share

Elwig/Resources/Sql/19-20.sql

@@ -0,0 +1,7 @@
+-- schema version 19 to 20
+
+ALTER TABLE season ADD COLUMN penalty_per_bs_amount INTEGER DEFAULT NULL;
+ALTER TABLE season ADD COLUMN penalty_per_bs_none   INTEGER DEFAULT NULL;
+DROP VIEW v_penalty_business_shares;
+
+UPDATE season SET penalty_none = NULL;