added get_yaml_file() to ScriptHelpers; expanded null_nhs_numbers.pl to include all requests, and exempted clinical_trials section of nhs_numbers_exempt.yml
bugfixes to RequestUpdate::do_trial_number_update() - checks for patient/trial entry before trying to insert new one; unfixed_histology_samples.pl date range error
patched ScriptHelpers::send_mail() to accept recipient in email address format; patched HMRN treatment data validation to exempt default date from chronological order test; modifcations to requests_and_reports.pl
new_pnh_alert, juvenile_diagnosis_status_alert & chest_clinic_diagnosis_alert log sucessful emails to request_history; refactored some repeated code in ScriptHelpers
adapted M::Chart::get_param_monitoring_data() to accept arrayref of presentation terms as well as scalar; added CSF context warning directly to record/body.tt
