[schema] Drop accepted_format attribute of script entity types

This is not used in this cube and should be handled in downstream application.

migration/0.2.0_Any.py

@@ -4,7 +4,6 @@ def copy_script(eid, etype, **kwargs):
     """
     script = cnx.entity_from_eid(eid)
     kwargs['name'] = script.name
-    kwargs['accepted_format'] = script.accepted_format
     kwargs['implemented_by'] = script.implemented_by
     new = create_entity(etype, **kwargs)
     script.cw_delete()

schema.py

@@ -127,12 +127,6 @@ File.__permissions__.update({'update': _update_file_perms,
 
 class _Script(EntityType):
     name = String(required=True, fulltextindexed=True)
-    accepted_format = String(
-        maxsize=128,
-        description=_('the MIME type of input files that this script accepts '
-                      '(if unspecified, the script is assumed to handle any '
-                      'kind of format)'),
-    )
 
 
 class implemented_by(RelationDefinition):