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
C::Result::preview_datafile() callback function to load flow data PDF; moved @skip_orgs list from activity_data.pl & national_code_unknown.pl into cron settings.cfg
outreach charts don't plot unless 2 or more datasets; added find GP by practice function to outreach demographics; set permissions mode on all crons so svk revert on production doesn't revert to 644; set results summary to default open on report page - correctly this time
more patches to cron scripts - all date subtractions performed on a new time_now() object in ScriptHelpers::date_subtract(), NOT on the local object in case it's used again after the DT subtract() function performed
amended all cron scripts which used DateTime directly to use L::Local::Utils::time_now() instead, so time calculated correctly at day rollover (ie considers BST); patched Utils::time_now() to accept args for DT constructor (eg formatter)
moved search term highlighting in referral resource finder to a callback so html is escaped first, then search term highlighted; speeded up Excel file search in L::Local::ExcelHandler::_read_file() using add_trigger()
