[PATCH] run a hook for each patch on apply

This patch make darcs running a script for each patch apply by 'apply' 
command. If exists, _darcs/prefs/onapply is called with patch hash as first 
argument. The goal is clearly to send a mail when a new commit is done on a 
main repository. This cannot be done properly with standard posthook as he 
don't remain which patch was applied during darcs call.

The _darcs/prefs/onapply script should be executable.

For example:

#!/bin/sh
darcs changes --summary --match "hash $1"

Output:

[nanardon@draco testing]$ /home/users/olivier/projects/darcs/darcs/darcs apply 
--mark-conflicts  bundle
Tue Jan 24 23:32:09 CET 2006  nanardon@xxxxxxxxxxxxxxxxx
  * add

    A ./foo
Tue Jan 24 23:32:27 CET 2006  nanardon@xxxxxxxxxxxxxxxxx
  * te

    M ./foo +1
Finished applying...


Comment on the implementation are welcome, as comment about my haskell code.

hook-onapply
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