This patch adds notifiers for when a particle system is renamed, and also when modifiers are renamed. I've place both of these notifiers in the NC_OBJECT category under ND_PARTICLE_RENAME and ND_MODIFIER_RENAME. When ND_PARTICLE_RENAME is activated, it redraws the properties editor and the outliner. When ND_MODIFIER_RENAME is activated it redraws the properties editor, graph editor, dopesheet, and the outliner.