new eco classification using pgn-extract magic
remove WhiteEngineOptions/BlackEngineOptions PGN tags, implement game comment, writing the configuration information into that instead. CB interfaces can't accept tags longer than 126 chars
ensure Latin1 for C strings
comments should have spaces on either side
more elegant and efficient use of pgn-extract to get ECO data
windows: engine processes are now part of the 'job' and are properly quit when killing the app