Adding support for displaying plugins available variable into Beremiz plugin tree
<HTML>
<BODY>
<CENTER>
<IMG SRC="../images/splash.png">
<BR><BR>
<font size="3">Beremiz is an Open Source framework for automation.</font>
<BR><BR>
<a href="http://www.beremiz.org/">http://www.beremiz.org/</a>
<BR><BR>
<TABLE border="0">
<TR>
<TD align="right" valign="top">
Contributor :
</TD>
<TD align="left" valign="top">
University of Porto<BR>
<a href="http://www.fe.up.pt/si/web_page.inicial">http://www.fe.up.pt/si/web_page.inicial</a>
</TD>
</TR>
<TR>
<TD align="right" valign="top">
Supported by :
</TD>
<TD align="left" valign="top">
LOLITech<BR>
<a href="http://www.lolitech.fr">http://www.lolitech.fr</a>
</TD>
</TR>
</TABLE>
</CENTER>
</BODY>
</HTML>