Add dsl for outcome schemas (tables) for roqua

lib/quby/compiler/outputs/roqua_serializer.rb

@@ -77,7 +77,7 @@ module Quby
 
         # configuration for outcome tables.
         # tables:
-        #   <outcome_table:Symbol>: # each pair is a table.
+        #   <outcome_table_name:Symbol>: # each entry is a table.
         #     score_keys: Set[<schema.key:Symbol>] # rows in the table
         #     subscore_keys: Set[<subschema.key:Symbol>] # columns  in the table
         # headers:
@@ -99,7 +99,7 @@ module Quby
           
           {
             headers: headers,
-            tables: tables.values,
+            tables: tables,
           }
         end
       end