Use a smaller number of neighbours and larger h-tolerance for the stars in the…

Use a smaller number of neighbours and larger h-tolerance for the stars in the EAGLE examples to follow what was done in the Ref model.

examples/EAGLE_ICs/EAGLE_12/eagle_12.yml

@@ -51,6 +51,11 @@ SPH:
   minimal_temperature:   100.0    # (internal units)
   initial_temperature:   268.7
 
+# Parameters of the stars neighbour search
+Stars:
+  resolution_eta:        1.1642   # Target smoothing length in units of the mean inter-particle separation
+  h_tolerance:           7e-3
+
 # Parameters for the Friends-Of-Friends algorithm
 FOF:
   basename:                        fof_output  # Filename for the FOF outputs.