shortuser should stop before the first space character.
Examples:
"Foo Bar <foo.bar AT example DOT com>" -> "foo.bar"
(instead of "foo.bar AT example DOT com>" as it was before.)
"Foo Bar" -> "Foo"
#header## HG changeset patch# User #author## Date #date|hgdate## Node ID #node##parent%changesetparent##desc##diff#