fixup! lui: introduce, use get_command_channel_nml

Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>
lui: additional debugging information in lui_connect

Signed-off-by: Jeff Epler <jepler@unpythonic.net>
lui: wait substantially longer for a status buffer

Signed-off-by: Jeff Epler <jepler@unpythonic.net>