Now does a bit more complete cleanup at exit when communicating with the Tcl-DP driver, to avoid potential problems.
Now does a bit more complete cleanup at exit when communicating with the
Tcl-DP driver, to avoid potential problems.

svn path=/trunk/; revision=1351

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