cvsps: cvs log loop uses lookahead to avoid misleading text
Changes cvsps.py's cvs log reader to use a one-line lookahead, so
that possibly misleading log messages can be disambiguated. In
particular I have past committers who used cvs log's 28-character
row of hyphens within commit messages; this throws cvsps and disrupts
conversion. The only alternative in this case is to edit the cvs
,v file by hand, which bloodies mercurial's "don't change history"
principle.
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