nanni_items.php: in IAA measure, fix bug that was causing some undercounting of weak links
make notes in history view more prominent
new variable:  for part-of-speech files; get_key_value(): optional locking; reconcile(): if two versions are identical, guarantee no problem is encountered
chunk labeling support for supersense tags (uses POS tags). also, reconciliation failure now displays '#cannot-auto-reconcile#' rather than the plain sentence, and new=^ can be specified for (the reconciliation of) other *newer* versions to supersede the user's current version