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
moved function to fill in missing data points for turnaround charts from audit class to chart class; re-installed x_percentile callback for tt to allow several values to be calculated; fixed sql comment in library.sql causing error.log entries
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
