Implement two-kanji -inscriptions

Implement two-kanji -inscriptions

When the -inscriptions option specifies a UTF8 string that starts with
the character '2', it will assume the symbols that follow have to be
drawn on the pieces in (vertically stacked) pairs of somewhat smaller
size than it would use for single-character inscriptions. An optional
'1' at the start of the string could be used as an escape to be used
when the first character we want to inscribe would be a '2'.