error: use detailed exit code 10 for command errors
Command errors (unknown or ambiguous commands, or bad command
arguments or options) are handled in the `dispatch` module. Most other
errors are handled in the `scmutil` module. This patch therefore has
to duplicate a little bit of code from the `scmutil` module. It's just
a few lines, however, so it seems fine to me. It's a pretty common
category of errors, so it's important to have them respect
`ui.detailed-exit-code`.
Differential Revision: https://phab.mercurial-scm.org/D9777
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