#383038 by markDrupal - Userreference: fix broken 'reverse links' with fields in per-type table (as a TODO reminder for now)

Change hook_field_attach_insert to hook_field_attach_pre_insert. The former seems not to exist anymore.

Port of #399778 by Benjamin Melençon - Nodereference / Userreference: Add 'size' setting to autocomplete widgets.
+ fixes hook_field_widget_settings_form() implementations in user_ref and node_ref.

#366470 Found a fix for the problem not getting the menu tabs on new content types. Also starting work on fieldgroup module.

Remove demofield module that is really not needed any more with the UI working. Also do some more work toward getting node_reference and user_reference working. Not done yet, but fewer errors :)

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

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