*** The function char-boundary-p returns non-nil if position POS is<BR>
between two characters in the buffer (not in the middle of a
character).
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When the value is non-nil, it says what kind of character follows POS:
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 0 if POS is at an ASCII character or at the end of range,
 1 if POS is before a 2-byte length multi-byte form,
 2 if POS is at a head of 3-byte length multi-byte form,
 3 if POS is at a head of 4-byte length multi-byte form,
 4 if POS is at a head of multi-byte form of a composite character.
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