GitLab

After replaying a set of actions downloaded by gnus-cloud, persist the
highest sequence number seen as the local `gnus-cloud-sequence'
number, in order that a future download will not unnecessarily replay
previously seen actions and any future uploads from this emacs
instance use a higher sequence number than that downloaded.

Remove the test on whether individual newsrc entries are older than
the current time, as that is always going to be the case.