substitute remaining hard-coded 'hmrn' db-name with variable picked up from hmrn_db method * working hmrn_data.t

interim update; adapt HMRN model to load test hmrn database

pre-screen worklist can specify required cols; new function for hiv chart get max value; added new data point to QLABS data feed; added HMRN PET scan templates

HMRN data collection templates; extended HMRN potential new malignancies function to include known previous diagnoses list; renamed M::HMRN::Data::all_diagnoses() to all_icdo3_diagnoses() & modified for use with M::HMRN::get_previous_diagnoses()