flags: allow distinct sets of flags.
A FlagSet is an independent set of flags that may be used, for example, to provide flag processing for subcommands in a CLI. The standard, os.Args-derived set of flags is a global but non-exported FlagSet and the standard functions are wrappers for methods of that FlagSet. Allow the programmer to control whether the program exits if there is a parse error. For the default set, the behavior remains to exit on error. The handling of Usage is odd due to backward compatibility. R=golang-dev, bradfitz, r, bradfitz CC=golang-dev https://golang.org/cl/4517092
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