[Bug-gsl] slightly misleading error message

[Federico Zenith]

Hi,
in roots/roots.h, SAFE_FUNC_CALL is defined. If the function returns 
"something icky", as the comment states, it is refused, and the message 
"function not continuous" is printed.

In my case, I had this message even if my function was continuous, since there 
was yet another problem (uninitialised variable somewhere in the code, which 
caused the interval to be from 0 to 0). I think a message like "function not 
accepted, possibly not continuous" would be better, so that users don't look 
in the wrong place.

Cheers,
-Federico

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