XNAT-4393 It turns out that DICOM tags have an unfortunate tendency of using...

XNAT-4393 It turns out that DICOM tags have an unfortunate tendency of using good typographical but poor programming practices. Thus tags like "Performing Physician’s Name" use the closing single quote beloved of typographers but something of a scourge to HTML rendering. Added checks for other scoundrels of rendering: ‘, ’, “, ”, as well as their more mundane cousins ', ", <, and >.