Raw data files not closed in meta scans

In waferprobing it came up that raw data files of all scans are apparently only closed once the script terminates. If you run a script that calls e.g. 89x5 scans, there will be 89x5 open files by the end of the script.

/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_205018_threshold_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_211712_threshold_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_211628_digital_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181218_010429_threshold_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_153429_threshold_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181218_010351_digital_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_170358_digital_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181218_003555_threshold_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_212732_stuck_pixel_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_211648_analog_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_204954_analog_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_153315_stuck_pixel_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_170341_stuck_pixel_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_212800_analog_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_163356_stuck_pixel_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181218_003436_stuck_pixel_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_211620_stuck_pixel_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_153332_digital_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_212723_register_test.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_212819_threshold_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_215718_stuck_pixel_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181218_010410_analog_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_211609_register_test.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_153400_analog_scan.h5...done
/home/test-person/git/bdaq53/bdaq53/scans/output_data/20181217_212741_d