Moved definition of window coordinate structure into plplot.h since it's now used in the plstream definition.  Also updated prototype for pldtik and added prototype for pldprec.
Moved definition of window coordinate structure into plplot.h since it's
now used in the plstream definition.  Also updated prototype for pldtik
and added prototype for pldprec.

svn path=/trunk/; revision=1423

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