compute itemrepository version from version plus KDEVELOP_VERSION
This ensures that for each release, we clear the item repository. In the past, we had various issues related to old caches -- this change should avold that, since we no longer need to remember to bump the ITEMREPOSITORY_VERSION variable on each release. Changing ITEMREPOSITORY_VERSION is still possible to force a clear even if KDEVELOP_VERSION is untouched.
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