user-specified locations. Remove installation of default book...it's so small
that it's pretty much useless anyway. See games/gnuchess-book-* for chess
opening books for GNU Chess.
Version 5.00 is the current release. Version 5.00 shares no code with
versions 1.x through 4.x. The major motivation for this release is to
simplify chess code making it more pedantically accessible, use modern
data structures, make it easy to modify by less skilled programmers,
and increase understandability to non-programmer, skilled chess
experts.