[issue188] add canned formats to output filespec of hg export

[TK Soh]

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

It'd be nice to have some canned formats representing the commonly used
combinations to take the tedious work out of composing them manually. Think "%c"
in strftime().

For example, "%c" for "%b-%R-%h"

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messages: 861
nosy: tksoh
priority: wish
status: unread
title: add canned formats to output filespec of hg export

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Mercurial issue tracker <mercurial-bugs at selenic.com>
<http://www.selenic.com/mercurial/bts/issue188>
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