Changed boolean operation OR from element-by-element to short-circuit (as it was intended to be, originally).  This was causing an error in Octave 2.1.50.
Changed boolean operation OR from element-by-element to short-circuit (as it
was intended to be, originally).  This was causing an error in Octave
2.1.50.

svn path=/trunk/; revision=5214

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