Suggested tune/tuneup.c patch

[Torbjörn Granlund]

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

  Below patch adds a helper function for tuning *_METHOD values,
  evaluated at some fix size. What do you think?

It helps with some function comments, outlining what a function does,
and what its arguments mean.

Please consider adding that before committing.  And please take a
screenshot of the affected parameters before and after this change, as a
sanity check.


-- 
Torbjörn
Please encrypt, key id 0xC8601622