Lists all BTR tag identifiers.

Values:

IGMDTAG_ID_BTR_FORMAT	BTR metadata format identifier.
IGMDTAG_ID_BTR_MANUFACTURER	Manufacturer value.
IGMDTAG_ID_BTR_VERSION	Version value.
IGMDTAG_ID_BTR_IMAGETYPE	Image type.
IGMDTAG_ID_BTR_HORZRES	Horizontal resolution.
IGMDTAG_ID_BTR_VERTRES	Vertical resolution.
IGMDTAG_ID_BTR_BITSPERPIXEL	Bits per pixel.
IGMDTAG_ID_BTR_PIXELSPERLINE	Pixels per line.
IGMDTAG_ID_BTR_STORAGEFMT	Storage format.
IGMDTAG_ID_BTR_TRANSFMT	Trans format.
IGMDTAG_ID_BTR_PREVPAGE	Previous page.
IGMDTAG_ID_BTR_NEXTPAGE	Next page.
IGMDTAG_ID_BTR_NUMLINES	Number of lines.