Split into two routines, one as a front-end to the driver interface fill routine, and the other as a target of the driver interface when the driver doesn't support the desired fill capability.
Split into two routines, one as a front-end to the driver interface fill
routine, and the other as a target of the driver interface when the driver
doesn't support the desired fill capability.

svn path=/trunk/; revision=732

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