Add a convert-ly rule for xxx #'yyy #'zzz = -> xxx.yyy.zzz =

Add a convert-ly rule for xxx #'yyy #'zzz = -> xxx.yyy.zzz =

Alist assignments can also use symbol list syntax as of issue 3748.
So the examples for nested layout variable assignments should actually
use those.


Also contains commit:

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


When pushed to staging, another commit reverting the convert-ly rule
will be added since we don't want to apply somewhat generic patterns
like those on unknown user-provided code when unchanged code remains
valid.

It turns out that this conversion applies to seriously erroneous
documentation in Documentation/notation/spacing.itely and translations
where normal assignments and overrides are getting confused.  Fixing
that would be a separate issue.

[Trevor Daniels, 2014-08-17 09:55:20]

LGTM

Trevor

[dak, 2014-08-17 12:42:37]

conversion rule is only temporarily, so converted imported snippets need to be
retained explicitly

[dak, 2014-08-17 12:43:38]

Rebase on current master