Include-guarded.  Now includes file tclMatrix.h, to pick up the new matrix command support.  Prototype for plframe() moved here from plplot.h since it shouldn't be necessary for the user to explicitly refer to it any more (in lieu of using Pltk_Init()).
Include-guarded.  Now includes file tclMatrix.h, to pick up the new matrix
command support.  Prototype for plframe() moved here from plplot.h since
it shouldn't be necessary for the user to explicitly refer to it any more
(in lieu of using Pltk_Init()).

svn path=/trunk/; revision=975

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