Squashed commit of the following:

commit 40fef9d21093a5f2a2ce65b2ca5f9f6eda7c3792
Merge: 05ced8c f445e14
Author: Jari Oksanen <jari.oksanen@oulu.fi>
Date:   Thu Oct 23 12:15:00 2014 +0300

    Merge pull request #62 from gavinsimpson/fix-plot-limits-issue

    extract all scores when setting x and y limits for plot

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/vegan@2904 edb9625f-4e0d-4859-8d74-9fd3b1da38cb