Added check for the version of Gnuplot.

Must be 1.8

diff --git a/tests/sdcard/plot_sdcard.py b/tests/sdcard/plot_sdcard.py
index 246d7f5..0959465 100755 (executable)
--- a/tests/sdcard/plot_sdcard.py
+++ b/tests/sdcard/plot_sdcard.py
@@ -328,4 +328,7 @@ def main(argv):
 
 
 if __name__ == '__main__':
+  if Gnuplot.__version__ != "1.8":
+    print "Gnuplot should be 1.8. See REAME file"
+    sys.exit(2)
   main(sys.argv)