New operator for copying (hair) particle systems from one object to

another, including edit data (grooming).

This uses basically the same method as the existing connect/disconnect
feature. The main difference is that it allows working with multiple
objects and transferring the //particle/hair data// instead of the
//mesh// data (which is what connect/disconnect expects). This is a much
more realistic workflow when rigging, topology etc. changes and
groomed hair has to be transferred to the changed model.

source/blender/blenkernel/intern/particle.c

@@ -3041,6 +3041,7 @@ void object_remove_particle_system(Scene *UNUSED(scene), Object *ob)
 	DAG_relations_tag_update(G.main);
 	DAG_id_tag_update(&ob->id, OB_RECALC_DATA);
 }
+
 static void default_particle_settings(ParticleSettings *part)
 {
 	part->type = PART_EMITTER;