Hello,

The attatched gets rid of the immediate problem of cntrl-z not working. 
   When async, it calls cli_command_loop.  Thanks to mark for analyzing 
the problem.

It should eventually be called via the CLI interpreter's command loop 
but that can follow.  This is to get over the immediate problem (and 
hey, while we're at it, eliminate a reference to the global 
command_loop_hook).

committed,
Andrew

PS: The TUI also appears to have also suffered in the fallout :-(