cmdutil: fix accidental name clash with revrange function The revrange function was used further up, and when a local variable is defined with the same name, the earlier call to revrange becomes a 'local variable used before assignment' error. The clash was introduced in 890ad9d6a169.

commands: fix update's help to be more accurate Branches can have multiple heads, so it doesn't make sense to speak of "the head of the current branch". What update really does is try to update to the *tip* of the current branch.

i18n: use encoding.colwidth() for correct column width Some encoding and language combinations (e.g.: UTF-8 and Japanese) cause encoding characters into sequence of bytes more than column width of them. So, encoding.colwidth() should be applied instread of len() on i18n strings. In addition to it, formatting by '%*s'/'%-*s' also uses "number of bytes" to calculate space padding size, and should be fixed, too.