Order all fields

Order fields of a structure array on all levels

A recursive version of MatLab function "orderfields".

Like "orderfields", function "OrderAllFields" orders fieldnames in a structure array by sorting them alphabetically. Contrary to "orderfields", which only orders top-level fields, function "OrderAllFields" orders fields of a structure array on all its levels (thereby also passing levels which have a cell array structure rather than a structure array structure).