Sometimes we want to clean up *after* a command has completed, but
we're moving to a model where all libplugin operations require a
`struct command`. This adds `aux_command` to create an
independent-lifetime command with the same id.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Any file in this directory which is executable and whose name only
consists of alphanumeric characters, space, '.', '-' or '_' will be
automatically loaded when lightningd starts (unless suppressed with
commandline options).
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