[TxMt] background commands

[Federico Galassi]

Regarding TM's adherence to unix philosophy, it seems weird to
me one cannot execute a command in background. Setting output to
"Discard" is supposed to do just that, while it actually freezes TM
until command exits. This virtually rules out any long running command  
in TM.
I know "Show as html" will behave that way, but it's more a (ugly)
workaround. I'd like to see it fixed or at least a "Discard and close"
option added.

Thank you,
Federico Galassi