add force_permissive to config __iter__

tiramisu/config.py

@@ -97,7 +97,7 @@ class SubConfig(object):
     #    return not self == other
 
     # ______________________________________________________________________
-    def __iter__(self):
+    def __iter__(self, force_permissive=False):
         """Pythonesque way of parsing group's ordered options.
         iteration only on Options (not OptionDescriptions)"""
         for child in self.cfgimpl_get_description()._impl_getchildren(
@@ -105,7 +105,8 @@ class SubConfig(object):
             if not child.impl_is_optiondescription():
                 try:
                     name = child.impl_getname()
-                    yield name, getattr(self, name)
+                    yield name, self.getattr(name,
+                                             force_permissive=force_permissive)
                 except GeneratorExit:  # pragma: optional cover
                     raise StopIteration
                 except PropertiesOptionError:  # pragma: optional cover

tiramisu/value.py

@@ -300,7 +300,7 @@ class Values(object):
         return value
 
     def __setitem__(self, opt, value):  # pragma: optional cover
-        raise ValueError(_('you should only set value with config'))
+        raise ConfigError(_('you should only set value with config'))
 
     def setitem(self, opt, value, path, force_permissive=False,
                 is_write=True):