SIC - fixed FFS designation vars

Found error in FFS designation part_ab and hmo_d variables so fixed
them, kept in old version for comparison purposes, but should delete
eventually
Ran through code with change in dementia flag as requiring more than one
dementia diagnosis and updated comments accordingly
Spouse - fixed FFS designation vars

Added in old, incorrect version for comparison but need to delete to
avoid confusion
Added old one to sample selection table so can let KO know the impact
Spouse claims - more work

Minor updates to variable names and comments when ran code for getting
ffs medicare / indicator for xwalk for spouses
Fixed error in getting the buyin and hmo variables
Surgery - fixed FFS designation vars

Ran through code, need to send along paper updates to reflect updated
sample