disable more features when using 'git format-patch'
    
    In my .gitconfig I have this:
    
      [format]
              useAutoBase = true
              thread = shallow
    
    As a consequence, when I run generate-patches-from-git-repo.sh I see
    two problems, first, I see lots of errors like this:
    
      fatal: failed to get upstream, if you want to record base commit automatically,
      please use git branch --set-upstream-to to track a remote branch.
      Or you could specify base commit by --base=<base-commit-id> manually
    
    These are caused by the use of the useAutoBase option.
    
    If I disable useAutoBase, and regenerate the patches, I see that every
    patch changes, with the addition of a line like this:
    
      Message-Id: <some message id string here...>
    
    This is caused by the use of the thread option.
    
    Rather than forcing me to not have these settings in my .gitconfig, I
    propose that we add --no-base and --no-thread to our invocation of
    'git format-patch' in generate-patches-from-git-repo.sh, this fixes
    both of the above problems.
    
    With these new options the 'git format-patch' line was getting pretty
    long, so I've wrapped it to make it more readable.