Make this suitable as a module for importing into pythondemos.py or prova.py. i.e., remove plplot calls that made this a standalone example.
Make this suitable as a module for importing into pythondemos.py or prova.py.
i.e., remove plplot calls that made this a standalone example.

Ordinarily would also restore defaults, but they seem not to be messed with
so there is nothing to do.

svn path=/trunk/; revision=3696

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