SIC added cause of death, claims dod

Also added p1 ivws without ffs medicare to try and fill in missing
Added change functional status n0 to exit interview
OOP work

Set OOP nights = non medicare nights where OOP calculated nights is
greater than the number of self report nights
Drop some oop dataset variables before set up to merge
Misc work getting merging oop datasets to run
Added nh imputed variables to the output tables