Issue #1414858 by danielb: Removal of apache solr integration.
Issue #1356112 by jmonkfish: Update to preserving available options keys.
Permission 'Use PHP for field settings (dangerous - grant with care)' replaced with 'use PHP for settings'.
Issue #1474658 by danielb, iancm: Maxlength correction in field widget.
Issue #1315754 by Liam Morland, dawansv: Empty value property.