compose_kiwi_description: check for changed files #148
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Check generated files for changes compared to existing ones and delete unchanged files.
Add option to check existing image description for stale files (i.e. files not generated by the new image definition), and remove those (enabled by default).
Do not abort anymore if the generated change log has no new entries, but base decision to abort or proceed on result of the above checks.
This addresses #107 and #115.