PATCH: issue 1116 (fill-line regression 2.13.11 to 2.13.12+)

[Alexander Kobel]

See <http://codereview.appspot.com/1689041>.

My fix tries to reintroduce the behaviour of 2.13.11 for the issue 
mentioned, before my patch to 
<http://www.mail-archive.com/address@hidden/msg27098.html>, but 
to keep the 2.13.12+ behaviour for more than two elements inside a 
fill-line.
Besides, I tried to tackle the issue I mentioned here: 
<http://www.mail-archive.com/address@hidden/msg51242.html>, which 
is that nested fill-lines used to shift their contents by some amount to 
the right.

I still think that fill-line is badly specified for single arguments, 
but I can't think of any better rationale for it as well.

For some reason, I don't seem to be able to build the regtests; so all 
this should be taken with care, I did not really check if it breaks 
anything.
And once again, please clean up the indentation.  The "real" sources 
just look like a complete mess in my Emacs configuration.  I did not try 
to understand this, but rather to guess my tabs and spaces to fit...


Cheers,
Alexander