Changed orient-setting code to switch on the basis of orient%2 and orient%4, so that any value of orient gives valid output.
Changed orient-setting code to switch on the basis of orient%2 and orient%4,
so that any value of orient gives valid output.

svn path=/trunk/; revision=167

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