user could delete informations set in config

tiramisu/config.py

@@ -606,6 +606,9 @@ class _CommonConfig(SubConfig):
         """
         return self._impl_values.get_information(key, default)
 
+    def impl_del_information(self, key, raises=True):
+        self._impl_values.del_information(key, raises)
+
     # ----- state
     def __getstate__(self):
         if self._impl_meta is not None:

tiramisu/storage/dictionary/value.py

@@ -235,6 +235,13 @@ class Values(Cache):
                                " not found: {0}").format(key))
         return value
 
+    def del_information(self, key, raises):
+        if key in self._informations:
+            del(self._informations[key])
+        else:
+            if raises:
+                raise ValueError(_("information's item not found {0}").format(key))
+
     def exportation(self, session, fake=False):
         return self._values
 

tiramisu/value.py

@@ -599,6 +599,9 @@ class Values(object):
         """
         return self._p_.get_information(key, default)
 
+    def del_information(self, key, raises=True):
+        self._p_.del_information(key, raises)
+
     def mandatory_warnings(self, force_permissive=False, validate=True):
         """convenience function to trace Options that are mandatory and
         where no value has been set