Add option to allow hash output instead of array output

[pvdvreede]

current output gives a full array within arrays.

It would be good to have output that would have an array of hashes, where the segment identifier is the key, for example:

[
  { "UNH" => [["SSDD1"], ["ORDERS", "D", "03B", "UN", "EAN008"]] },
  { "BGM" => [[220], ["BKOD99"], [9]] }
]