Big refactor:
 - comorbid broken out into new parse.R for parsing co-morbidity data. This requires package functions so can't be dumped in /data.
 - quanCharlson now named more accurately quanDeyo.
 - validate changed to invalidAction, with ignore, silent (NA), warn (NA) and stop options for many functions. Default is 'ignore' for speed, except for comorbidity generation where 'stop' is preferred.
 - yet more whitespace fixes
 - documentation updates
 - tests updated, but still holes to fill.
 - tests broken out into several files
 -
and update the quan deyo data now it is renamed.