[darcs-devel] darcs patch: fix for issue 490 (and 2 more)

[Eric Kow]

I wasn't too sure about my conflicts fix.  Thought you folks might want to have
a look, but will push these in next week if nobody says anything.

Fri Jun 29 21:57:41 CEST 2007  David Roundy <droundy at darcs.net>
  * fix for issue 490
  This patch ensures that we never try to use a checkpoint
  for a tag that isn't in a place where the inventory is
  broken.
  
  It's a little ugly because it also puts more of the checkpoint
  handling code in Checkpoint, which required a refactor to avoid
  import loops.

Sun Jul  8 13:26:18 CEST 2007  Eric Kow <eric.kow at loria.fr>
  * Fix issue490 conflicts.

Sun Jul  8 13:36:13 CEST 2007  Eric Kow <eric.kow at loria.fr>
  * Use listToMaybe instead of safehead.

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