[cdebconf] slang frontend

[barbier@linuxfr.org (Denis Barbier)]

Hi,

if there are no objections I will change the behaviour of
boolean/select/multiselect questions in the slang frontend so that
  * space bar select/deselect an item
  * Enter key jumps to the Next button
Are there other problems with the slang frontend that should be
addressed?  It seems quite usable, maybe 'make demo' could allow
its use.

Denis