Merge branch 'jc/maint-filter-branch-epoch-date'

In 1.7.9 era, we taught "git rebase" about the raw timestamp format
but we did not teach the same trick to "filter-branch", which rolled
a similar logic on its own.  Because of this, "filter-branch" failed
to rewrite commits with ancient timestamps.

* jc/maint-filter-branch-epoch-date:
  t7003: add test to filter a branch with a commit at epoch
  date.c: Fix off by one error in object-header date parsing
  filter-branch: do not forget the '@' prefix to force git-timestamp

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