Fixed an off-by-one error in indexOfVisiblePointClosestToPlotAreaPoint. It wasn't considering the first visible point.
Fixed an off-by-one error in indexOfVisiblePointClosestToPlotAreaPoint. It wasn't considering the first visible point.

divyavamsee/core-plot,tectronics/core-plot,sureshdustrise/core-plot,kamalvenkat/core-plot,sureshdustrise/core-plot,LiDechao/core-plot,tectronics/core-plot,kamalvenkat/core-plot,zenXian/core-plot,tectronics/core-plot,divyavamsee/core-plot,kamalvenkat/core-plot,kamalvenkat/core-plot,zenXian/core-plot,zenXian/core-plot,eoinnorris/core-plot,sureshdustrise/core-plot,LiDechao/core-plot,eoinnorris/core-plot,LiDechao/core-plot,eoinnorris/core-plot,zenXian/core-plot,eoinnorris/core-plot,divyavamsee/core-plot,divyavamsee/core-plot,LiDechao/core-plot,sureshdustrise/core-plot,tectronics/core-plot