* Allow for nested contexts of any depth.

[hanwenn]

Reviewers: Neil Puttock,


http://codereview.appspot.com/7261/diff/1/2
File lily/context-def.cc (right):

http://codereview.appspot.com/7261/diff/1/2#newcode215
Line 215: seen = new set<const Context_def *> ();
Can you make a wrapper function that does

 set<..> seen;
 path_to (.. , &seen)

instead?

document the seen argument in the comment.

http://codereview.appspot.com/7261/diff/1/4
File ly/engraver-init.ly (left):

http://codereview.appspot.com/7261/diff/1/4#oldcode109
Line 109: \name "InnerChoirStaff"
make convert rule for this too.

Description:
* Allow for nested contexts of any depth.
- use a set to keep track of visited contexts
- remove InnerChoirStaff and InnerStaffGroup

Please review this at http://codereview.appspot.com/7261

Affected files:
  M lily/context-def.cc
  M lily/include/context-def.hh
  M ly/engraver-init.ly