(mchrstr, lchrstr): Change element types of m_item[] and l_item[] to

(mchrstr, lchrstr): Change element types of m_item[] and l_item[] to
short, to match shp_item and lnd_item.
(mchr_ca, lchr_ca): Replace selector item by selectors for the items.
lchr_ca's item selector was incorrect and worked only by accident.