Andrew Gallant 8cb5833ef9 argv: update clap to 2.29.4 ...

We use the new AppSettings::AllArgsOverrideSelf to permit all flags to
be specified multiple times. This removes the need for our previous
work-around where we would enable `multiple` for every flag and then
just extract the last value when consuming clap's matches.

We also add a couple regression tests that ensure repeated switches and
flags work as expected.

2018-02-06 12:07:59 -05:00

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