* Show group-level details of commands
Details can be defined at either a group command or its subcommand of
the same name. If define on group-level it will also be shown in the
group help without needing ??.
* Fix > $ redirection for errored command and leak
* Rewrite ar and dr commands with newshell
Breaking changes:
ar* => arf, ar- => arf-, ar. => ar*
ar, => art, ar? => arq
ar0 => ara0, arb => arab, ars => araS
arC => arpC
arn => arR
art => arT
arf => arF
Removed: drm, aer