[Primeusers] Cannot run program

[arve]

> Up to a value of c. 830 I still get the same message ie attempting to 
> divide by zero. After that (850 upwards) I get a different message at an 
> earlier stage, just after it has output "start init fastGEM 
> BirthDeathProbs" and "end init fastGEM BirthDeathProbs" which is 
> "Exception std::bad_alloc".

Already c=250 is a large value, so with 850 you are running out of memory. 

But it is annoying that you still have problems with c=250. Would you mind sending me your species tree?

	Lars