GDP: where do we discuss MIDI?

[Graham Percival]

There are two options to this:

1)  Gather everything about MIDI into one section (currently 4.3) and 
mention everything there:

Currently LilyPond MIDI support includes
Dynamics        yes
Repeats         no, unless \unfoldRepeats is used
Articulations   no
Text            no, are you joking?


2)  Mention MIDI everywhere in the manual.

Dynamics

blah blah blah\mf blah

Dynamics are supported in MIDI.


Repeats

blah blah \repeat unfold blah {}

@refbugs

Repeats are not supported in MIDI unless you use \unfoldRepeats


...etc...


Opinions?  "both" is not an option, because the docs will become 
obsolete and contradictory when people only update one place.
- Graham