[ENH] Add --refresh flag to dm_qc_report

[DESm1th]

This PR fixes:

• A dm_qc_report.py doc string error telling users to load MATLAB instead of our actual module matlab (76634df)
• A function name typo that caused crashes when running dm_qc_report.py with the --remake flag (5a7d378)
• A recurring issue with dm_qc_report.py queue jobs timing out for very large scans (59f882c)
• A bug that stopped regeneration of existing QC files when running dm_qc_report.py with the --remake flag (3f6a409, bfadd08)

This PR adds:

• A --refresh flag so that header differences (and scan lengths) can be forced to be recalculated without having to delete existing files or waiting for all metrics to regenerate. This is useful when the IgnoreHeaderFields or HeaderFieldTolerance settings are updated in the config files and differences need to be cleared out in response. (dae19f5)