[barcode] streaming mode for pcl output

[Karl Berry]

Two very minor comments on the Texinfo ...

    +	@i{<height>}] [@t{+|-} @i{<xmargin>} @t{+|-} @i{<ymargin>}]'' (with

FWIW, in general it is better to use @var than @i{<...>}.  That's what
what @var is for.  As in:

  @var{height}] [@t{+|-} @var{xmargin} ...

    +	Articlename: EAN13START -b761005201696 -g30x10 EAN13END.

If this is a single line of an output file, better to enclose in
@example instead of typesetting as normal text.

@example
Articlename: EAN13START -b761005201696 -g30x10 EAN13END
@end example