Allow \partial to occur in mid-piece

Allow \partial to occur in mid-piece

This is done by moving measurePosition to negative values when at the
beginning of a measure, and to a respective distance before the end of
the measure in case the measure has already been started.

Also:

Document in-piece use of \partial

[pkx166h, 2013-11-03 17:04:27]

https://codereview.appspot.com/21370043/diff/1/Documentation/notation/rhythms...
File Documentation/notation/rhythms.itely (right):

https://codereview.appspot.com/21370043/diff/1/Documentation/notation/rhythms...
Documentation/notation/rhythms.itely:1458: #end-of-line-invisible
Is there perhaps a better way to illustrate this with out the need for a rather
complex-looking override?

[dak, 2013-11-03 19:33:22]

Make robust against multiple calls of \partial in a row

[dak, 2013-11-04 14:41:26]

Allow for multiple calls (really), better ties to Timing.

[dak, 2013-11-04 16:12:58]

Look for "Timing" alias after all

[dak, 2013-11-04 17:24:41]

https://codereview.appspot.com/21370043/diff/1/Documentation/notation/rhythms...
File Documentation/notation/rhythms.itely (right):

https://codereview.appspot.com/21370043/diff/1/Documentation/notation/rhythms...
Documentation/notation/rhythms.itely:1458: #end-of-line-invisible
On 2013/11/03 17:04:28, J_lowe wrote:
> Is there perhaps a better way to illustrate this with out the need for a
rather
> complex-looking override?

I can't think of anything doing the job even remotely as well.

[dak, 2013-11-04 17:41:58]

Make bar number overrides even more complex nbut much more useful