mkfitted: make a fitted .lgo file from .legofit output

usage: mkfitted <original.lgo> <fitted.legofit>

Copyright: Copyright (c) 2023, Alan R. Rogers roger.nosp@m.s@an.nosp@m.thro..nosp@m.utah.nosp@m..edu. This file is released under the Internet Systems Consortium License, which can be found in file "LICENSE".