Update to 5.1.0 version.  New location for man pages in /usr/share/man, different configuration parameters (especially dynamic drivers), and extra python module.
Update to 5.1.0 version.  New location for man pages in /usr/share/man,
different configuration parameters (especially dynamic drivers),
and extra python module.

svn path=/trunk/; revision=3549

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot