Added check for whether or not the users current version of AquaTerm supports alpha values.
Added check for whether or not the users current version of AquaTerm supports alpha values.

svn path=/trunk/; revision=8228

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