Squashed 'cwltool/schemas/' changes from e8a458b..6346fdf

6346fdf SchemaDef extends InputSchema

git-subtree-dir: cwltool/schemas
git-subtree-split: 6346fdf

Author: Peter Amstutz

draft-2/CommonWorkflowLanguage.yml

@@ -973,7 +973,7 @@ $graph:
 
 - type: record
   name: SchemaDef
-  extends: "#Schema"
+  extends: "#InputSchema"
   docParent: "#SchemaDefRequirement"
   specialize:
     - specializeFrom: "#Schema"