[crossfire] stealing abuse

[Preston Crow]

There are a number of abuses for the stealing skill to gain ridiculous 
XP.  Generally they all boil down to being able to get the stealing XP 
for a monster every time you steal from it, not just the first time.  
I'm not sure what the right fix would be, but one idea might be to 
insert an object into the monster when stealing xp is awarded to flag it 
as not granting stealing xp. That would eliminate the entire category of 
abuses.

Thoughts?  Anyone want to implement a solution?