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Make -Xlint a "multichoice" option for purposes of option parsing.
This allows turning on "lint with these warnings" instead of only
"turn off these warnings but enable other lint warnings".
```
$ scalac -Xlint:warn-adapted-args linty.scala # lint plus a warning
$ scalac -Xlint warn-adapted-args linty.scala # same
$ scalac -Xlint linty.scala # same as now
$ scalac -Xlint -- linty.scala # ok, not necessary
$ scalac -Xlint _ -- linty.scala # another funky underscore
```
This would also enable Xlint options that are not standalone options,
although that is not implemented in this commit. For example,
`-Xlint:no-missing-interpolator` could be used to disable that
warning. (There is no `-Xoption:flavor=off` syntax.) (`no-` switches
would not be enabled by `_`.)
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