Patch for File Transfer Progress Bar with Files > 2GB

[Per Allansson]

Thank you. This will be fixed in the next release.

  Rgds, Per

Dino Klein wrote:
> The progress bar in the transfer window goes fakakta when transferring
> files larger than 2GB. This happens because the progress bar uses int
> to represent min/max/progress, while a file size requires a long variable.
> So, I changed the progress bar not to use the file size as the max, but
> employ "steps"; this combined with a bit of arithmetic seems to take
> care of business.
    ...