[barcode] streaming mode for pcl output

[Alessandro Rubini]

> have you had a chance to look at it meanwhile?

Thanks for pointing it out.  I have been having barcode in my todo
list for a while, but things never go the way you want.  I'll try to
get at it in the next days -- I'm spending a lot of time on the train.

Sunday or monday I'll push out my git tree for barcode. Can you please
rebase your original git patch? that would be great to use

thanks
/alessandro