initial patch by nicholas_w and David Lesieur

#152270 keep db_rewrite_sql() from adding DISTINCT to nodereference nids by forcing a node.nid to the beginning of Views queries.

 moshe

 of the values with the first column (revert http://drupal.org/cvs?commit=58000)

 neclimdul

 handler)

 are moved from 'node_' to 'content_' namespace)
+ fixes for older 4.7 versions migration path
update.php required !!

 and KarenS

#88135 fix Views handling of multiple fields to allow an option to group multiple fields together with one node, patch by yched.

Split code for views.module and pathauto.module into separate includes, so we don't have to parse the code if the modules aren't being used.