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

svn path=/trunk/; revision=166

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