Issue #267: Ensure hidden flags/subcommands do not change help
Issue #267: Ensure hidden flags/subcommands do not change help

If a command has one flag which is hidden, it should not, for
instance, show the `Flags: ` heading.  Likewise there are other
items in the help template which should respect hidden/deprecated
state.

spf13/cobra,liggitt/cobra,eparis/cobra,anthonyfok/cobra