The "edit" function is not implemented in GNU Chess 5.00. This means
that XBoard's "Edit Position" feature will not work with it. Loading a
position from a file, loading a PGN game that starts from a nonstandard
position, or playing an ICS wild game in Zippy mode, etc., will also not
work.
Also fix the gnuchessx script to accept options and to pass them through to
the gnuchess binary.
Bump package version number to 5.00nb2.
29c533f2d9