Doc: Issue 4528/3 Document ssaattbb.ly built-in template

Doc: Issue 4528/3 Document ssaattbb.ly built-in template

Also amend documentation about the use of \layout and Layout,
and add note to make it clear that the TwoVoicesPerStaff
variables cannot be modified part-way through a score.

Issue 4528/2 Add regression tests for ssaattbb.ly built-in template


Issue 4528/1 Add ly/ssaattbb.ly built-in template

[Trevor Daniels, 2015-08-01 22:14:13]

https://codereview.appspot.com/256340043/diff/1/input/regression/ssaattbb-tem...
File input/regression/ssaattbb-template-with-changed-instrument-names.ly (left):

https://codereview.appspot.com/256340043/diff/1/input/regression/ssaattbb-tem...
input/regression/ssaattbb-template-with-changed-instrument-names.ly:5: can be
changed when using the satb built-in template."
git-cl is showing the wrong base file here.  While it's true I used this file as
the starting point, the ssaattbb file should be new, not shown as an update of
this one - and in my repository it is new and the satb file is still present and
correct.  ??

[benko.pal, 2015-08-02 05:55:31]

https://codereview.appspot.com/256340043/diff/1/input/regression/ssaattbb-tem...
File input/regression/ssaattbb-template-with-changed-instrument-names.ly (left):

https://codereview.appspot.com/256340043/diff/1/input/regression/ssaattbb-tem...
input/regression/ssaattbb-template-with-changed-instrument-names.ly:5: can be
changed when using the satb built-in template."
On 2015/08/01 22:14:13, Trevor Daniels wrote:
> git-cl is showing the wrong base file here.  While it's true I used this file
as
> the starting point, the ssaattbb file should be new, not shown as an update of
> this one - and in my repository it is new and the satb file is still present
and
> correct.  ??

git tracks complete trees; it does NOT track individual files directly.  by the
indirect mechanisms it found the new file as a slightly modified _copy_ of an
old one.

[Trevor Daniels, 2017-01-28 21:54:26]

Pushed to staging as three committishes
[r294da7e0401eb017dfb7f23a68e5b26b04cefb5a]
[re339344f98511d6abd6b44310f928215b0d726b9]
[r88aee98e9414b1ea25efbbec913960f26c6ced82]

Closing ...