#4906 ADD_ACKNOWLEDGER/LISTENER_FOR

[David Kastrup]

ADD_ACKNOWLEDGER/LISTENER_FOR

Add macros allowing to listen/acknowledge to events/grobs unrelated
to the actual listener name.

This is actually conflating a few issues tampering with the same code.
If review is unhappy about some parts, they can still be split out and
treated separately.

Also contains commits:

Use ADD_END_ACKNOWLEDGER_FOR in slur engravers

Don't let ADD_END_ACKNOWLEDGER_FOR add end_ to callback

[Note that those two commits might be a bit contentious. They make it
possible to get rid of Slur::acknowledge_end_tie as a stub calling
Slur::acknowledge_extra_object. The savings are not exactly
overwhelming, but there does not seem to be any other use of
ADD_END_ACKNOWLEDGER_FOR otherwise]

Use ADD_LISTENER/ACKNOWLEDGER_FOR in slur engravers

Rename ack_trampoline to trampoline

This allows foregoing a dummy Translator::ack_trampoline definition.

Rename ack_finder to method_finder

This additional overload streamlines things somewhat.

[Those last two commits are independent changes but touch the same code lines]

http://codereview.appspot.com/301070043

[Anonymous]

Passes make, make check and a full make doc.

[Anonymous]

Patch on countdown for July 3rd.

[Anonymous]

Patch counted down - please push.

[David Kastrup]

Pushed to staging as
commit 6acce8f4c900bee88c85a45b9ed1b29983891469
Author: David Kastrup dak@gnu.org
Date: Sun Jun 19 16:37:43 2016 +0200

Issue 4906/6: Use ADD_END_ACKNOWLEDGER_FOR in slur engravers

commit 369988ff777e4cec3228ee02a77f11e154cc842b
Author: David Kastrup dak@gnu.org
Date: Sun Jun 19 16:36:57 2016 +0200

Issue 4906/5: Don't let ADD_END_ACKNOWLEDGER_FOR add end_ to callback

commit ca91c4fef862a54df0c4af18235883518c475576
Author: David Kastrup dak@gnu.org
Date: Sat Jun 18 18:25:25 2016 +0200

Issue 4906/4: Use ADD_LISTENER/ACKNOWLEDGER_FOR in slur engravers

commit 3d76daf5b141b8ceeb3a04a7d001bfec857e1f1e
Author: David Kastrup dak@gnu.org
Date: Mon Jun 6 13:54:40 2016 +0200

Issue 4906/3: ADD_ACKNOWLEDGER/LISTENER_FOR

Add macros allowing to listen/acknowledge to events/grobs unrelated
to the actual listener name.

commit 1a4fcab3c11fc6523874bce6b5dfd37c362f22d6
Author: David Kastrup dak@gnu.org
Date: Sun Jun 26 09:49:30 2016 +0200

Issue 4906/2: Rename ack_trampoline to trampoline

This allows foregoing a dummy Translator::ack_trampoline definition.

commit 04f4d06dbdb8473548f2caec6da5d64e53804a30
Author: David Kastrup dak@gnu.org
Date: Sun Jun 26 00:32:38 2016 +0200

Issue 4906/1: Rename ack_finder to method_finder

This additional overload streamlines things somewhat.