npm / cli / #355

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npx: add install prompt, handle options correctly

- handle previous npx options that are still possible to be handled, and
  print a warning if any deprecated/removed options are used.
- expand shorthands properly in npx command line.
- take existing npm options into account when determining placement of
  the -- argument.
- document changes from previous versions of npx.

PR-URL: https://github.com/npm/cli/pull/1596
Credit: @isaacs
Close: #1596
Reviewed-by: @ruyadorno

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