new release candidate (gsl-1.5.90)

[Brian Gough]

Giulio Bottazzi writes:
 > Yes. Doubling the tolerance does indeed fix the problem. 
 > 
 > Just for curiosity, why this doubling is necessary on a 64 bit platform
 > and not necessary on a 32 bit? (Please, notice that the OS, compiler and
 > c library are the same on the two machines).

I don't know---the actual difference was a lot smaller than a factor
of 2 though I think, I just doubled the tolerance for convenience.  

-- 
Brian Gough