produce condensed AHRQ data by merging all the HTN, CHF and renal comorbidity subgroups
ignore a swap file, add ahrqComorbidAll to datadocs, make test for ahrq data to check identical to saved, not just equal. Allow return of condensed or uncondensed AHRQ data.
Merge branch 'ahrq-htn-chf-renal'

next step in processing AHRQ to roll all the detailed HTN, CHF and renal sub-groups into parent groups.
update version before CRAN resubmission