bghooks extension (first shot at background hooks)

[Dennis Schoen]

Hi all,

last week I needed to add a faily long running process as a  
changegroup hook
to one of our repositories. In middle of writing a python wrapper that  
forks
and dispatches the process I realized that most of it could be handled  
by a
generic background hook extension for mercurial.

So here's a first draft of "bghooks". This has alpha-works-for-me(tm)  
status,
so the usual precautions apply. ;-)

Enable the extension as usual:
#   [extensions]
#   hgext.bghooks =

configure your background processes like normal hooks:
#   [bghooks]
#   commit.update_test_suite = update_test_suite.sh
#   changegroup.update_remote = update_remote.sh

All comments, critics appreciated. You can also find me on IRC as  
"roccoblues".

cheers
dennis

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