To generate the parlay dissector from the .idl documents do:

idl2wrs Parlay.idl

The Parlay.idl file includes all the other .idl files to create one
dissector for Parlay.
2023-01-12 The Parlay dissector has been removed on the assumption that it is no longer required. These files will be kept around for a while
if the need to regenerate it should arise.
