Defines a field type Block reference which creates a relationship to a block and allows the block to be displayed as the content of the field. It saves this relationship using the block's
bid, not its delta + module.
Widget "Select list (with drag-and-drop sort)" has been deprecated. Use Multiple Selects instead!
N.B. Block configuration visibility settings are respected since version 7.x-1.14. If a referenced block does not appear when viewing the node, check the block's visibility settings on /admin/structure/block. Note that visibility settings are evaluated regardless of whether the block is assigned to a region.