[issue247] support custom diff util on hg diff

[TK Soh]

New submission from TK Soh <teekaysoh at gmail.com>:

to allow diffing of binary files such as MS-Excel spreadsheets via external
custom diff utils.

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messages: 1280
nosy: tksoh
priority: wish
status: unread
title: support custom diff util on hg diff

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Mercurial issue tracker <mercurial-bugs at selenic.com>
<http://www.selenic.com/mercurial/bts/issue247>
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