adapt turnaround times audit for NBT (don't use authorisation)

genomics sample linkage form; xsd validation for genomics_xml.pl; bugfix for audit/turnaround_percentile.tt - subtraction only performed if values exist

replaced Regexp::Common method of escaping mysql chars with conventional regex - was causing Override warning on subsequent method calls; removed clinical trial samples from turnaround time calculations; doi warnings on previous samples restricted to lab staff

added ability to download turnaround times data

fixed error in turnaround charts method where default query didn't separate BMA & BMAT; other minor turnaround times tweaks

some turnaround times chart tweaks - forgot png header, added specimen title to chart, removed 'by specimen' as option for turnaround times as no other in use

turnaround times 95-percentile charts; fixed ajax.t errs

added request turnaround times at 95th percentile audit