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>.

keyword: use context to detect uncommitted merge

tests: use --debug on test-clone

shrink-revlog: use util.mktempcopy() to preserve mode of index file. (There's still a chmod() call to manually preserve the mode of the data file.)

revset: delay import of hg to avoid start-up import loops

error: fix up test-hgrc

error: update test-trusted.py

revset: fix test failure with qfinish

revset: raise ParseError exceptions

error: add new ParseError for various parsing errors