Refactor icdo_category table to include only sub-categories - renamed to icdo_sub_category

replaced M::Ajax::check_exists() specific get_foo_count with generic get_objects_count

added ability to retrieve inactive legacy diagnosis to autosuggest diagnoses; changed DB::Diagnosis::Manager method name from 'diagnosiss'; patched national_code_unknown.pl cron to report 'no unknown codes' instead of blank message

HMRN calculation of indices

hilis3 conversion scripts for YHHN