Macros for use in escape function changed to have a prefix PLESC_, similarly those used in the state function start with PLSTATE_.  Some function prototypes added/deleted.
Macros for use in escape function changed to have a prefix PLESC_, similarly
those used in the state function start with PLSTATE_.  Some function
prototypes added/deleted.

svn path=/trunk/; revision=336

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