Do not write a message for opening a shapefile

This was polluting standard output. So we have to add the shapefile
path when it is not found.

Common/util_eddies.py

@@ -131,13 +131,12 @@ class SHPC_class:
         if layer not in self._readers[i_slice][orientation]:
             my_shapefile = path.join(self.dir, f"Slice_{i_slice}", orientation,
                                      layer)
-            print("Opening", my_shapefile, "...")
 
             try:
                 self._readers[i_slice][orientation][layer] \
                     = shapefile.Reader(my_shapefile)
             except shapefile.ShapefileException:
-                print("Not found")
+                print(f"get_reader: {my_shapefile} not found")
                 self._readers[i_slice][orientation][layer] = None
 
         return self._readers[i_slice][orientation][layer]