Cofactor canonicalisation of mpn_gcdext

[Torbjorn Granlund]

Bill Allombert <Bill.Allombert at math.u-bordeaux1.fr> writes:

  PS: A small nitpick: on www.gmplib.org, the link 'Documentation: 4.3.2 HTML'
  point to the GMP 5.0.0 documentation.
  
This has been fixed.  

-- 
Torbjörn