Changed constant to instant.

tests/test_cdf_const.in

@@ -40,8 +40,8 @@ fi
 #PATTERNS
 #^   File format : NetCDF
 #^   Var : Institut Source   Ttype    Levels Num  Gridsize Num Dtype : Parameter ID
-#^     1 : unknown  unknown  constant      1   1        72   1  F32  : -1         
-#^     2 : unknown  unknown  constant      5   2        72   1  F32  : -2         
+#^     1 : unknown  unknown  instant       1   1        72   1  F32  : -1         
+#^     2 : unknown  unknown  instant       5   2        72   1  F32  : -2         
 #^   Grid coordinates :
 #^     1 : lonlat                   : points=72 (12x6)
 #^                              lon : 0 to 330 by 30 degrees_east  circular