New ‘--list-generations’ and ‘--delete-generations’ options (was: Goals for 0.4)

[Nikita Karetnikov]

I’m trying to handle the “last-month” and the “first-month” cases.  I’d
like to use ‘profile-numbers’* to construct an alist of generations and
their creation dates.

What can I use to get the creation date of a file?  I can’t find
anything in the manual.

* We should rename it to ‘generation-numbers’ or something like that.

pgpETuluh_DNs.pgp
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