TODO for 5.2

[Torbjorn Granlund]

nisse at lysator.liu.se (Niels Möller) writes:

  > * Finalise and commit mpn_sec_minvert.
  
  Here's a new version, including tests. Seems to work. I'll try to get
  this committed fairly soon.
  
Nice!

I notice you make this non-public.  Is it premature to make it part of
the public interface?

  It would be good to also add some support in speed, so performance can
  be compared easily to gcdext and powm.
  
tune/speed and tests/devel/try support is always good.

The latter tends to find some out-of-bounds writes.

Unfortunately, try.c is messy.