MultiformatSlotExportFileOptionsWidget: Added support for 2 new formats: multipage tiff and multipage tiff sequence
DataExportOptionsDlg: Renormalization controls default to blank '--' text on dlg startup.
DataExport: Use TransactionSlot.
SubregionRoiWidget: Auto-resize column 0 on startup.
DataExportOptionsDlg: disconnect dtype slot if the user unchecks the dtype conversion checkbox.
DataExportOptionsDlg: Auto-set a reasonable axis order if the default order would be bad.