2.5 - Assorted Animation UI/Editing Tweaks

Main Feature:
* It is now possible to choose which AnimData block is the 'active' one for editing, and/or select them too. AnimData blocks are generally the dark blue and lighter-blue expanders (i.e. Scene, Object, Camera, Lamp, Curve, Armature, etc.)

* Objects are no longer selected/deselected when AKEY is used to toggle selection of channels. This was getting a bit annoying. 

* Following on from selection of AnimData blocks, it is now possible to select/make active an AnimData block in the animation editors, and change the active action for that block via the 'Animation Data' panel in NLA Editor's properties region.
--> Be aware that user-counts are not totally handled correctly there yet, so some funky behaviour might be seen...
--> It is possible to assign a new action, or to assign an existing one, allowing to switch between actions as in the past with Actions/IPO Editors...

Other tweaks:
* Some code tweaks towards making the 'Euler Filter' feature for Graph Editor working sometime soon
* Added some backend code for snapping the values of keyframes to a single value. Still need to work out some UI for it though.
* Shuffled the code for ACT_OT_new() around, and removed the poll() callback so that it worked in NLA too.
* Fixed some more notifier bugs with deleting bones and a few other editmode operations for Armatures.

source/blender/blenkernel/intern/anim_sys.c

@@ -244,6 +244,8 @@ void BKE_animdata_make_local(AnimData *adt)
 /* Check if some given RNA Path needs fixing - free the given path and set a new one as appropriate */
 static char *rna_path_rename_fix (ID *owner_id, PointerRNA *modPtr, char *newName, char *oldpath)
 {
+	
+	
 	return oldpath; // FIXME!!!
 }
 
@@ -264,7 +266,7 @@ static void fcurves_path_rename_fix (ID *owner_id, PointerRNA *modPtr, char *new
 			
 			/* driver targets */
 			for (dtar= driver->targets.first; dtar; dtar=dtar->next) {
-				dtat->rna_path= rna_path_rename_fix(owner_id, modPtr, newName, dtar->rna_path);
+				dtat->rna_path= rna_path_rename_fix(dtar->id, modPtr, newName, dtar->rna_path);
 			}
 		}
 	}