Changed name of struct to tclMatrix to avoid conflicts with C++ Matrix classes.  Put in ifdef-ed extern "C" linkage statements for C++.
Changed name of struct to tclMatrix to avoid conflicts with C++ Matrix
classes.  Put in ifdef-ed extern "C" linkage statements for C++.

svn path=/trunk/; revision=1008

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