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Supersedes #1065.
Fixes #1000
This PR does two things:
help
command so thatwill include
help
in the completion choices. This is done by the first commit provided by @voithos taken from #1065.help
command usingValidArgsFunction
so thatwill show all sub-commands (including
help
since<program> help help
is a valid command), andwill show all sub-commands of
<subCmd1>
. And so forth down the command tree.