new search field request date- refactored L::Local::Search::generate_query() date fields; need to fix validation on request date fields in main_form.tt
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()