commit f3debbd70c6ee3e5ca85bd4ebae8a4bcceede99f
author Todd Wang <toddw@google.com> Tue Nov 24 11:20:43 2015 -0800
committer Todd Wang <toddw@google.com> Tue Nov 24 11:20:43 2015 -0800
tree a0f1828daefe7ff6fdb1dc5f40004e46c1880c8b
parent a11fcdc3c6a0480f74404d4485ebf68c4e23fb0c

lib: Pass global and ancestor flags to external subcommands.

Updates the cmdline package to automatically pass through flags
set anywhere on the command line to external child commands.

This ensures that commands like "jiri -n go install all" pass the
-n flag through to jiri-go when it is invoked.

Also updated the semantics of setting cmdline.Command.Flags.
Previously if you defined a flag F on a command C, we'd only
allow parsing of F on the command line immediately after C.  Now
we allow F to be specified immediately after C, or after any
descendant of C.  Updated the help documentation accordingly.

Also updated documentation for help -style flag, and renamed the
"short" style to "shortonly" to make its purpose more clear.

And finally, updated the timer label "root" to the command path,
to make it easier to understand the output when -time is passed
through from jiri to its external subcommands.

Fixes https://github.com/vanadium/issues/issues/793

MultiPart: 3/4

Change-Id: I6d16d8dcf5592afec8d22bf2e53f9cbddcc396ce