GDP: Revision of NR 2 "Specialist Notation"

[Trevor Daniels]

The only outstanding point from the discussion so far is how to handle text 
which seems to belong in more than one place, like \downbow, which for 
completeness properly belongs in NR 1.3 Expressive, but which also should 
appear in NR 2.3.1.  My suggestion is that _explanations_ should go in the 
most general section, here NR 1.3, and only an example showing the use, 
without explanation, should appear elsewhere, together with an general 
redirection to NR 1.3 for details.  It would be even better if the example 
could be taken from a fragment of real music.  I think most other cases of 
duplication could be handled in a similar way.

So NR 2.3.1.2 Bowing indications might look like:

For a full description of bowing indications see NR 1.3 Expressive.  The 
following example shows how they are used in a fragment of real music.

@lilypond{...}
...
\upbow
...
\downbow
....
@end lilypond

Trevor D