p4verify.sh v5.15:
* The '-paths' and '-recent' options can now be used together, so recent
files in specified paths can be verified. Particularly useful for edge
servers and failover scenarios where earlier and more thorough vetting
has been done.
* The '-recent' now sports an optional '-recent=N' syntax to specify # of revs.
* Doc updates for above.
* Fixed minor ShellCheck compliance issues.