Convert author in Mercurial repositiories

This is a summary of StackOverflow question http://stackoverflow.com/questions/12136895/change-the-author-in-mercurial-history


- cd repo1/.hg
- vi .hgrc and add
        [extensions]
        hgext.convert=
- cd $HOME
- vi authors.convert.list
        USER1 =USER2
- hg convert --authors $HOME/authors.convert.list repo1 repo1.NEW