change to default so that completely non-finite data will not fail on the epsilon test

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@71 8a9318a1-56ba-4d59-b755-99d26321be01

pyglance/glance/delta.py

@@ -276,7 +276,7 @@ def _get_numerical_data_stats(a, b, diff_data, data_is_finite_mask, outside_epsi
     total_num_finite_values = sum(data_is_finite_mask)
     
     # no dividing by 0!
-    fraction_too_different = 1.0
+    fraction_too_different = 0.0
     fraction_perfect = 0.0
     if total_num_finite_values > 0 :
         fraction_too_different = num_finite_values_too_different / float(total_num_finite_values)