Merged revisions 1149487 via svnmerge from

https://kevin@svn.kde.org/home/kde/branches/KDE/4.5/kdepim

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  r1149487 | krake | 2010-07-13 16:49:00 +0200 (Tue, 13 Jul 2010) | 5 lines
  
  Purging MBoxes can invalidate item remote IDs (messages moving towards the front of the file).
  Replaces the synchronous (nested eventloops) item update code with asynchronous operations in a new helper class.
  The store increases the purged collection's remote revision whenever such a move occurs, the resource, via the helper, then updates the items.
  Until this update is completed (marked by updating the collection for the new remote revision) item remoteIds are mapped to the ones for the current revision.
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svn path=/trunk/KDE/kdepim/runtime/; revision=1149537