keyword: eliminate potential reference cycles from kwrepo - delete kwrepo.commitctx after using the tweaked version - prefer self.hook over repo.hook to avoid nesting Also pass arguments to commit as arbitrary list. Thanks to Simon Heimberg and Matt Mackall for guidance.

convert/cvs: improve error message on unexpected server output.

transaction: fix uncaught ENOENT (issue1724) The opener raises an IOError on errors where transaction expects an OSError.