@sweep fails to detect some say/pose/etc. traps

[charlesreiss]

The built-in command @sweep is intended to identify say traps on the environment, but it assumes that say traps will be linked to a MUF program. Therefore, it won't detect some secnario like:

@create ThingWithSayTrap
@act say=ThingWithSayTrap
@lock say=me&!me
@link say=here
@fail say={null:some MPI that does something with {&arg}}
drop ThingWithSayTrap
@sweep

[wyld-sw]

@Sweep should now report any linked exit matching the name, regardless of destination type.