Issue 2924: Doc: \startMeasureCount and \stopMeasureCount needs documenting

Issue 2924: Doc: \startMeasureCount and \stopMeasureCount needs documenting

The following patch is a preliminary step towards documenting the
Measure_counter_engraver added in version 2.17.7.  The patch consists of
two snippets, the first illustrating basic usage, and the second demonstrating
a workaround for creating centered bar numbers.

[david.nalesnik, 2013-03-17 02:14:28]

Please review.

Thanks!
David

[PhilEHolmes, 2013-03-17 10:35:40]

I've not tested the snippets, but otherwise the patch LGTM.  I'm assuming the
only files you actually created were the ones in snippets/new/ - the rest came
from makelsr and make doc?

[david.nalesnik, 2013-03-17 11:25:43]

On 2013/03/17 10:35:40, PhilEHolmes wrote:
> I've not tested the snippets, but otherwise the patch LGTM.  I'm assuming the
> only files you actually created were the ones in snippets/new/ - the rest came
> from makelsr and make doc?

Yes, exactly.

[janek, 2013-03-17 16:41:11]

LGTM

[Graham Percival, 2013-03-21 03:14:51]

LGTM

[david.nalesnik, 2013-03-23 12:54:24]

Thank you all for the reviews!