New bar line interface: include whichBar in convert-ly rule for bar line changes

This is a follow-up of Issue 2790 and commit
cced43289cf170305e6e6517180659a1c4fa91db.

The whichBar property is not set explicitly anywhere
in the sources and thus was forgotten in the commit above.

[janek, 2012-10-21 16:46:36]

Was it not for Graham Percival, to whom i dedicate all my code reviews, i would
have not find enough willpower to write a review!
(seriously!)
:)

So, Marc, the problem is that convert-ly rule didn't convert commands involving
whicBar context property?  Like, \set Staff.whichBar = \"|:\" should be
converted to set Staff.whichBar = \".|:\"?

If so, please write it a bit more explicitely in the commit message, and
reference Bar Line Interface's issue number and committish.  Other than this,
LGTM.

cheers,
Janek

[marc, 2012-10-21 17:25:55]

On 2012/10/21 16:46:36, janek wrote:
> Was it not for Graham Percival, to whom i dedicate all my code reviews, i
would
> have not find enough willpower to write a review!
> (seriously!)
> :)
> 
> So, Marc, the problem is that convert-ly rule didn't convert commands
involving
> whicBar context property?  Like, \set Staff.whichBar = \"|:\" should be
> converted to set Staff.whichBar = \".|:\"?
> 
> If so, please write it a bit more explicitely in the commit message, and
> reference Bar Line Interface's issue number and committish.  Other than this,
> LGTM.
> 
> cheers,
> Janek

OK, will do.

[janek, 2012-10-21 17:36:40]

Thanks, Marc!

i suggest to abbreviate the committish (first 10 digits should be enough - git
recognizes abbreviated committishes as long as they are unique) - first line of
the commit message should be around 50-60 chars for the sake of nice display in
logs.

best & sorry for nitpicking & LGTM,
Janek