Minor improvements to the scan tool

As a follow up to ORC-697, I have a couple more adjustments. Changes:

• Change the stripe id to be 0 based, which seems more consistent.
• Change the end of file stripe id to be the number of stripes rather than -1.
• Limit the recovery row to the start of the next stripe.
• Add --verbose that prints exceptions.
• Fix the --help to give more information