#4811 Allow property paths as scalars and in assignments

[David Kastrup]

Allow property paths as scalars and in assignments

They cannot be embedded LilyPond since #{ 2 . 2 #} already is valid
music.

Property paths must have at least two syntactic elements to be
recognized as such and must not start with a Scheme expression.
Technically, 3 . #'() counts.

This affects overrides and sets as well.

Also contains commits:

Run scripts/auxiliar/update-with-convert-ly.sh

convert-ly rule for nicer beatStructure syntax

http://codereview.appspot.com/290650043

[Simon Albrecht]

Amazing.

[Anonymous]

Passes make, make check and a full make doc.

[Anonymous]

Patch on countdown for March 28th

[Anonymous]

Patch counted down - please push.

[David Kastrup]

Pushed to staging as
commit 3ecc98aa5db8a47adcf9defc4ec9fc018c5cc47d
Author: David Kastrup dak@gnu.org
Date: Tue Mar 29 08:02:00 2016 +0200

Run scripts/auxiliar/update-with-convert-ly.sh

commit bb3285ff1f4cd437ba52afbaa53e7ff5946a7140
Author: David Kastrup dak@gnu.org
Date: Wed Mar 23 17:31:21 2016 +0100

Issue 4811/2: convert-ly rule for nicer beatStructure syntax

commit 2a66e23f356503ef916d51efa3f00cae5958dc48
Author: David Kastrup dak@gnu.org
Date: Wed Mar 23 00:05:16 2016 +0100

Issue 4811/1: Allow property paths as scalars and in assignments

They cannot be embedded LilyPond since #{ 2 . 2 #} already is valid
music.

Property paths must have at least two syntactic elements to be
recognized as such and must not start with a Scheme expression.
Technically, 3 . #'() counts.

This affects overrides and sets as well.