update: warn about other topological head in pull and unbundle
Other commands have a '--update' triggering a bare update. We now issue the
message introduced into the previous changeset for these too.
#require test-repo
$ cd "$TESTDIR"/..
New errors are not allowed. Warnings are strongly discouraged.
$ hg files "set:(**.py or **.txt) - tests/**" | sed 's|\\|/|g' |
> python contrib/check-config.py