[PATCH] Fast forward strategies allow, never, and only

I am hereby sending an updated version of these patches as
attachments to this mail.  The patch series consists of the
following six patches:

  0001-Documentation-for-joining-more-than-two-histories.patch
  0002-New-merge-tests.patch
  0003-Introduce-ff-fast-forward-option.patch
  0004-Restructure-git-merge.sh.patch
  0005-Head-reduction-before-selecting-merge-strategy.patch
  0006-Introduce-fast-forward-option-only.patch

The first patch add some documentation, for how git currently handles
merges where more than one remote is involved.   The second patch add
some tests.  The third, fifth, and sixth adds new features and they are all
trivial.  The fourth patch computes the reduced parents but uses it only
to determine whether we are up-to-date or doing a fast forward.

-- 
Sverre Hvammen Johansen