doc additions power chords

doc additions power chords
additions to fretted-strings.itely description and examples for the use of the new command \powerChords
addition of two new modifiers to notation-appendices.itely

power chord symbol
Added power chord definition, symbol and command to typeset this symbol.

[Carl, 2010-10-23 00:07:44]

Patrick Schmidt has added two- and three-note power chords to the known set of
chord names.

He's provided both code and docs.

Please review.

Thanks,

Carl

[Graham Percival (old account), 2010-10-23 01:30:43]

Looks mostly fine.

http://codereview.appspot.com/2686041/diff/1/Documentation/notation/fretted-s...
File Documentation/notation/fretted-strings.itely (right):

http://codereview.appspot.com/2686041/diff/1/Documentation/notation/fretted-s...
Documentation/notation/fretted-strings.itely:1416: \clef "treble_8"
None of these lines should be indented.

http://codereview.appspot.com/2686041/diff/1/Documentation/notation/fretted-s...
Documentation/notation/fretted-strings.itely:1478: \clef "treble_8"
None of these lines should be indented.  Also, remove the [fragment].

[Carl, 2010-10-23 02:47:45]

On 2010/10/23 01:30:43, Graham Percival wrote:
> Looks mostly fine.
> 
Fixed all of these, plus another couple of lines of LilyPond code that were
incorrectly indented.

[Graham Percival (old account), 2010-10-23 05:30:24]

LGTM, go ahead and push.

http://codereview.appspot.com/2686041/diff/5001/Documentation/notation/frette...
File Documentation/notation/fretted-strings.itely (right):

http://codereview.appspot.com/2686041/diff/5001/Documentation/notation/frette...
Documentation/notation/fretted-strings.itely:1422: g-\rightHandFinger #3
c-\rightHandFinger #4 >1
The intent here was to show that the g was still part of the chord.

Since we don't have a formal input syntax style yet, I don't mind this change. 
Just thought I'd mention it; if you'd rather keep the original version, that'd
also be fine.

[Trevor Daniels, 2010-10-23 05:56:16]

LGTM, but we should add power chords to the glossary and reference it from the
@seealso.
Trevor

http://codereview.appspot.com/2686041/diff/5001/Documentation/notation/frette...
File Documentation/notation/fretted-strings.itely (right):

http://codereview.appspot.com/2686041/diff/5001/Documentation/notation/frette...
Documentation/notation/fretted-strings.itely:1580: @cindex power chords
+@cindex chords, power too

[Valentin Villenave, 2010-10-23 08:42:09]

On 2010/10/23 05:56:16, Trevor Daniels wrote:
> LGTM, but we should add power chords to the glossary and reference it from the
> @seealso.

To whomever pushes this patch: please remember to update
http://code.google.com/p/lilypond/issues/detail?id=1315 accordingly :-)

Cheers,
Valentin