Speedometer doesn't use 2x2 mosaic characters (an intermediate between block and unicode)

[rbanffy]

Not all terminals can display the characters used for smooth blocks, but most terminals, including, IIRC, the Linux console, can display 2x2 mosaic characters, which would still allow double the vertical resolution. It'd be useful to have another option, not unlike -b for the old block approach, to use those characters.