PATCH: "veto exempt" (actually works now)

[Freddie]

Hi,

My last attempt at a veto exempt patch sort of crashed and burned... I only 
changed one bit of code (in dir.c), not the actualy veto macro. This one 
works, it's not very big (changes maybe 8 lines of code), but it is rather 
useful for me.

You specify users/groups the same way you do with the other parameters that 
take it (valid users etc), and it ignores the "veto files" parameter for 
those users/groups. Simple.

Freddie