(issue869) Add spacer for multiline items This works because single line values now have a height of 15 + spacer (which amounts to the 20 it was before). Multiline columns can have any height as this is generated automatically on breaks to show all text. We now add +5 there so that they have at least some space.

<?xml version="1.0" encoding="UTF-8" ?>
<rest-server>
    <!--  The port which the ArtifactDatabase (ArtifactServer) will bind to. -->
    <port>8181</port>
    <listen>localhost</listen>
</rest-server>