Disallow edition.

Creation and modification dates are not object properties, they are provided by
getter methods and shall be never set directly.

Conflicts:

	product/ERP5/bootstrap/erp5_core/bt/revision

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_viewMetadata/my_creation_date.xml

@@ -10,6 +10,7 @@
             <key> <string>delegated_list</string> </key>
             <value>
               <list>
+                <string>editable</string>
                 <string>title</string>
               </list>
             </value>
@@ -71,6 +72,10 @@
             <key> <string>values</string> </key>
             <value>
               <dictionary>
+                <item>
+                    <key> <string>editable</string> </key>
+                    <value> <int>0</int> </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>my_date</string> </value>

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_viewMetadata/my_modification_date.xml

@@ -10,6 +10,7 @@
             <key> <string>delegated_list</string> </key>
             <value>
               <list>
+                <string>editable</string>
                 <string>title</string>
               </list>
             </value>
@@ -71,6 +72,10 @@
             <key> <string>values</string> </key>
             <value>
               <dictionary>
+                <item>
+                    <key> <string>editable</string> </key>
+                    <value> <int>0</int> </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>my_date</string> </value>

product/ERP5/bootstrap/erp5_core/bt/revision

-40988
\ No newline at end of file
+40989
\ No newline at end of file