java codegen - override fromDoc on Savable instances.
java codegen - override fromDoc on Savable instances.

arguably should be constructors?

common-workflow-language/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad