(Module): sump fixed, loop imx fixed, and simplifications.

(Module): sump fixed, loop imx fixed, and simplifications.
(Module): If the status is missing at the last wave but we know
that the person is alive, then we can code his/her status as -2
(instead of missing=-1 in earlier versions) and his/her
contributions to the likelihood is 1 - Prob of dying from last
health status (= 1-p13= p11+p12 in the easiest case of somebody in
the healthy state at last known wave). Version is 0.98