Squashed commit of the following:

commit 99497ed4df72cad5213596a4355ac96c02ff438a
Author: Jari Oksanen <jari.oksanen@oulu.fi>
Date:   Mon Dec 15 16:22:39 2014 +0200

    remove graphics from \link[graphics]{foo}

commit cf5e04469b8bddd2adc98111fb54c4ba7df87143
Author: Jari Oksanen <jari.oksanen@oulu.fi>
Date:   Mon Dec 15 16:20:45 2014 +0200

    remove stats from \link[stats]{foo}

commit e326f4a2e963c84ed1fbb3bb7333f47e656f39f4
Author: Jari Oksanen <jari.oksanen@oulu.fi>
Date:   Mon Dec 15 16:17:32 2014 +0200

    Remove base from \link[base]{foo}

commit 03afa339f63aaa237c201fb9dee553645600e44d
Author: Jari Oksanen <jari.oksanen@oulu.fi>
Date:   Mon Dec 15 16:16:01 2014 +0200

    Remove vegan from \link[vegan]{foo}

commit 38513bc95502460d49f5654cdb9fe7f547518419
Author: Jari Oksanen <jari.oksanen@oulu.fi>
Date:   Mon Dec 15 12:03:37 2014 +0200

    mvpart was archived on Dec 13, 2014: Rd cross-reference was removed

    Brian Ripley sent an email on Dec 14, 2014, saying:

    Its checks are now giving warnings:

    * checking Rd cross-references ... WARNING
    Unknown package ‘mvpart’ in Rd xrefs

    That package is not mentioned in the DESCRIPTION file (it should have
    been), and has finally been archived.

    Please submit an update correcting this.

    This was also raised as issue #90 github.

    (cherry picked from commit 3cd09798f4c1604daa3208843d05f28c27068ed7)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/vegan@2922 edb9625f-4e0d-4859-8d74-9fd3b1da38cb