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rename: add hint about --at-rev if source file doesn't exist

Authored by martinvonz.

Description

rename: add hint about --at-rev if source file doesn't exist

It's quite common that users want to record copy (rename) information
after committing the working copy changes (i.e. an added and a deleted
file). When they try hg mv [--after] <src> <dst>, that just fails
because the source file doesn't exist. It seems helpful if we can
point them to --at-rev=. in this case.

Differential Revision: https://phab.mercurial-scm.org/D10697

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