Please add option to ignore timestamp differences in containers
*This bug was originally reported by Felipe Sateler (fsateler@debian.org) in Debian bug [#907600](https://bugs.debian.org/907600):* ``` diffoscope has been a very useful tool for me, in comparing dumps of various sorts spit out by several systems. It would be great to have an option to ignore timestamps, in order to be able to check if two tarballs/zipballs/whateverballs have the same contents, even if the contents were generated on different dates. ```
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