Add --line-number option to hg annotate (issue506)
Line numbers are separated from the last annotation element with a colon,
like with many other commands, e.g. (hg) grep or compiler errors.
Idea and tests by FUJIWARA Katsunori.
*** failed to import extension badext: bit bucket overflow
extension 'hgext.gpg' overrides commands: sigs sigcheck sign
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