Bug#737499: pristine-tar: enable files >2GB by upgrading to xdelta3

[Andreas Tille <tille@debian.org>]

Package: pristine-tar
Severity: important

Hi,

a member did some investigation why pristine-tar is failing with some
quite large upstream tarball.  The full analysis can be seen here:

   https://lists.debian.org/debian-med/2014/02/msg00021.html

It boils down that xdelta has a restriction which makes it incapable to
deal with files > 2GB which is a known issue (#205112, may be same issue
as #145370) which never got any response.  According to Luis' analysis
the issue is solved in xdelta3.  

I have no idea why more packages in Debian rdepend from the outdated
xdelta than from xdelta3 but to me it seems to be advisable to either
deprecate xdelta usage or fix the 2GB issue.  Since the later does not
seem to be the case I'd suggest to upgrading to xdelta3 or if possible
enable an option to alternatively use xdelta3 when dealing with large
archives.

Kind regards and thanks for maintaining pristine-tar

       Andreas.

-- System Information:
Debian Release: 7.3
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 2.6.36-xenU-4814-i386 (SMP w/1 CPU core)
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