Bug#313204: dpkg: Support to configure 'DIFF' through environment variable.

[sdfsdf <fsdfsd@matveev.spb.ru>]

Package: dpkg
Version: 1.10.28
Severity: wishlist


    Please, add ability to change DIFF define from environment variable
(DPKGDIFF, by example). I think, 'vimdiff -vo' is more usefull and more
suitable in many cases. With vimdiff I can overwiew changes and quickly
transfer appropriate changes in my old config.

    After exit I'll just press enter (to 'N' in dpkg) and will get working
config.

-- System Information:
Debian Release: 3.1
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/dash
Kernel: Linux 2.6.8-2-686
Locale: LANG=ru_RU.KOI8-R, LC_CTYPE=ru_RU.KOI8-R (charmap=KOI8-R)

Versions of packages dpkg depends on:
ii  dselect                     1.10.28      a user tool to manage Debian packa
ii  libc6                       2.3.2.ds1-22 GNU C Library: Shared libraries an

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