Added support data structures and constant definitions for plplot options handling code.  Added function prototypes for new functions and deleted a couple.  Eliminated case of VOID == char since that should never be necessary with ANSI C.
Added support data structures and constant definitions for plplot options
handling code.  Added function prototypes for new functions and deleted
a couple.  Eliminated case of VOID == char since that should never be
necessary with ANSI C.

svn path=/trunk/; revision=107

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