input/test deletions, round 4.

[Graham Percival]

There's a few files leftover from last time (namely the slur-* files), and
a few new ones.

address@hidden:~/dev/lilypond/input/test$ grep DELETE * -l
perform-tie.ly
simple-slur-endings.ly
slur-area.ly
slur-attachment.ly
slur-broken-cross-staff.ly
slur-broken.ly
slur-damping.ly
slur-follow-music.ly
slur-positions.ly
slur-proof.ly
slur-symmetry-2.ly
slur-symmetry-3.ly
span-bars.ly
tie-broken.ly


permform-tie was on the last list; Han said "idem", which I didn't understand.


On the subject of @cindex vs. @keyword, make web complains when I try to compile
things using @keyword or @ckeyword.  Shall I keep on using @cindex for now?  
Once
the @keyword macro is define, it should be simple to change all the @cindex into
@keyword.

Cheers,
- Graham