replace Python standard textwrap by MBCS sensitive one for i18n text Mercurial has problem around text wrapping/filling in MBCS encoding environment, because standard 'textwrap' module of Python can not treat it correctly. It splits byte sequence for one character into two lines. According to unicode specification, "east asian width" classifies characters into: W(ide), N(arrow), F(ull-width), H(alf-width), A(mbiguous) W/N/F/H can be always recognized as 2/1/2/1 bytes in byte sequence, but 'A' can not. Size of 'A' depends on language in which it is used. Unicode specification says: If the context(= language) cannot be established reliably they should be treated as narrow characters by default but many of class 'A' characters are full-width, at least, in Japanese environment. So, this patch treats class 'A' characters as full-width always for safety wrapping. This patch focuses only on MBCS safe-ness, not on writing/printing rule strict wrapping for each languages MBCS sensitive textwrap class is originally implemented by ITO Nobuaki <daydream.trippers@gmail.com>.