erp5_web: Use "limit" so sort is applied before projection.

As this means sorting had no effect, drop sorting on versions: versions
are arbitrary strings which can have any evolution scheme, so do not try
to guess what is more recent than something else.

bt5/erp5_web/SkinTemplateItem/portal_skins/erp5_web/WebSection_getDocumentValue.xml

@@ -91,8 +91,8 @@ web_page_list = portal_catalog(reference=name,\n
                                portal_type=valid_portal_type_list,\n
                                validation_state=validation_state,\n
                                language=(language, \'\'),\n
-                               sort_on=[(\'language\', \'descending\'), (\'version\', \'descending\')],\n
-                               group_by=(\'reference\',),\n
+                               sort_on=[(\'language\', \'descending\'), ],\n
+                               limit=1,\n
                                **kw)\n
 \n
 if len(web_page_list) == 0 and language != \'en\':\n
@@ -101,8 +101,7 @@ if len(web_page_list) == 0 and language != \'en\':\n
                                  portal_type=valid_portal_type_list,\n
                                  validation_state=validation_state,\n
                                  language=\'en\',\n
-                                 sort_on=[(\'version\', \'descending\')],\n
-                                 group_by=(\'reference\',),\n
+                                 limit=1,\n
                                  **kw)\n
 \n
 if len(web_page_list) == 0:\n
@@ -110,8 +109,7 @@ if len(web_page_list) == 0:\n
   web_page_list = portal_catalog(reference=name,\n
                                  portal_type=valid_portal_type_list,\n
                                  validation_state=validation_state,\n
-                                 sort_on=[(\'version\', \'descending\')],\n
-                                 group_by=(\'reference\',),\n
+                                 limit=1,\n
                                  **kw)\n
 \n
 if len(web_page_list) == 0:\n

bt5/erp5_web/bt/revision

-1109
\ No newline at end of file
+1110