All core source files: made another pass to eliminate warnings when using gcc -Wall.  Lots of cleaning up: got rid of includes of math.h or string.h (now included by plplot.h), and other minor changes.  Now each file has global access to the plstream pointer via extern; many accessor functions eliminated as a result.  Subpage initialization code moved to this file -- subpage settings can now be changed any time (previously, it had to be done before calling plinit).
All core source files: made another pass to eliminate warnings when using
gcc -Wall.  Lots of cleaning up: got rid of includes of math.h or string.h
(now included by plplot.h), and other minor changes.  Now each file has
global access to the plstream pointer via extern; many accessor functions
eliminated as a result.  Subpage initialization code moved to this file --
subpage settings can now be changed any time (previously, it had to be
done before calling plinit).

svn path=/trunk/; revision=1025

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