Fixed a bug (could be seen in example 16) which I was after a long time. fill_polygon() now initializes canvas if device is not ready.
Fixed a bug (could be seen in example 16) which I was after a long time. fill_polygon() now initializes canvas if device is not ready.

svn path=/trunk/; revision=7301

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