
Fix reading of pgm files in octave version of example 20. The CR-LF 
combination wasn't properly being handled, resulting in an off by one 
error in the file reading. New method works fine on Linux and should 
also work on other systems. Results now identical with C version.


svn path=/trunk/; revision=7931

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