Sped up ext_index_all and added blist_PREPARE_WRITE
Sped up ext_index_all and added blist_PREPARE_WRITE

darcs-hash:20090329132217-a5408-9913a4ee94e3520c5ff924cded5dd6da5729901a.gz

DanielStutzbach/blist,DanielStutzbach/blist,pfmoore/blist,pfmoore/blist