#368155 Nodereference/Userreference: Fix performance issue on large sites when validating empty noderef/userref fields.

#346202 Fieldgroup: let the 'simple' template be overridable (thks fiskit) + allow template variants.

#374213 by rpanna - Fieldgroup: All field instances removed their groups when one instance is deleted from a content type.

#366935 by drewish - Make the 'Views mode' feature in noderef / ueserref visible even if no usable View exists yet.

#353012 User reference - fix duplicate 'reverse links' on user profile pages when the same user is referenced by several userref fields in a node. Also improves performance by avoiding a full node_load

#336174 Move actual field access check in content.module, with content_permission.module providing one permission-based implementation.

#339537 followup - fix upgrade function for db prefixes - make that a new update, to be sure everyone gets it properly.

+ abstract a few element validators

#339537 by markus_petrux: fix orphan fields in {content_group_fields} table when fields are removed.

#331995 Fix 'invalid argument for foreach' warning on nodes with inexistent type. (#327715 followup - content_types() *always* returns a non-array, so testing "if ($type =  content_types($foo))" is useless

#311912 Views integration: The many_to_one filters for fields with 'allowed values' gain should not replace the regular 'starts with'/'greater than' filters.

via the powerful l10n_server site http://forditas.mindworks.hu .