lots of whitespace changes in test-icd9
reduced number of iterations in test
sas.R whitespace and documentation
lots of whitespace clean-up, and coding style corrections.
correct typo introduced by coding style improvement.
rename Quan to reflect the origin in Charlson comorbidities, vs the alternative Elixhauser update, also by Quan.
Numerous coding style updates, e.g. T to TRUE, and whitespace.
partially implemented and tested icd9Condense to take fully-fleshed out range, and return minimal number of parent ICD-9 codes.