- encode 'text' from database encoding to ASCII

        to_ascii('\256\341k')


 to_ascii( text, int4 )

        - encode 'text' from 'int4' encoding to ASCII

          to_ascii('\256\341k', 8)


 to_ascii( text, name )

        - encode 'text' from 'name' encoding to ASCII

          to_ascii('\256\341k', 'LATIN2')


  Now is supported LATIN1, LATIN2, WIN1250. For other character sets I
haven't good resources. Add new encoding is easy...

 If encoding is not supported returns ERROR.

 Note --- not exists total corect conversion to ASCII, this function try
        convert chars those is _probably_ interpret-able in ASCII for
        others use ' '. But for example for all Czech characters it is
        sufficient ... hmm Chinese / JAP and other complicated langs
have
        bad luck here :-(

                                                Karel