reading in hair with dynamics wasnt working but mostly crashed when duplicating the object.

from reading all places dynamic hair is used I think these changes are correct (cloth seems to share pointcache with the psys) but its not obvious.

jahka: please check this is ok.

source/blender/blenkernel/intern/object.c

@@ -1164,6 +1164,12 @@ ParticleSystem *copy_particlesystem(ParticleSystem *psys)
 	
 	psysn->pointcache= BKE_ptcache_copy_list(&psysn->ptcaches, &psys->ptcaches);
 
+	/* XXX - from reading existing code this seems correct but intended usage of
+	 * pointcache should /w cloth should be added in 'ParticleSystem' - campbell */
+	if(psysn->clmd) {
+		psysn->clmd->point_cache= psysn->pointcache;
+	}
+
 	id_us_plus((ID *)psysn->part);
 
 	return psysn;

source/blender/blenloader/intern/readfile.c

@@ -3187,6 +3187,13 @@ static void lib_link_particlesystems(FileData *fd, Object *ob, ID *id, ListBase
 				pt->ob=newlibadr(fd, id->lib, pt->ob);
 
 			psys->target_ob = newlibadr(fd, id->lib, psys->target_ob);
+
+			if(psys->clmd) {
+				/* XXX - from reading existing code this seems correct but intended usage of
+				 * pointcache should /w cloth should be added in 'ParticleSystem' - campbell */
+				psys->clmd->point_cache= psys->pointcache;
+				psys->clmd->ptcaches.first= psys->clmd->ptcaches.last= NULL;
+			}
 		}
 		else {
 			/* particle modifier must be removed before particle system */