OOP work on splitting into HRR quintiles

Updated zip code var length=5, not sure why but it was 200 before
Updated zip/hrr/mc spending xwalks to Amy's PC file paths
Minor fixes to zip/hrr/dartmouth mc spending merge code to get it to run
Dropped observations missing dementia probability from 5 year spending
tabulations
Added table showing reasons for missing dementia probability for the 5
year lookback sample
Work around getting quintiles by HRR level spending
SIC - adl depend vs nh res & p1 outcomes

Added table checking ADL dependence vs nursing home residence, there are
people who report no ADL help needed but that live in a nursing home
Added table looking at 1 year p1 outcomes, comparing those that meet
criteria p1 and those that don't, for criteria a and b