Add script to download the yield tables from the stellar evolution example.

examples/SubgridTests/StellarEvolution/getYieldTable.sh

+#!/bin/bash
+wget http://virgodb.cosma.dur.ac.uk/swift-webstorage/YieldTables/EAGLE/yieldtables.tar.gz
+tar -xf yieldtables.tar.gz

examples/SubgridTests/StellarEvolution/stellar_evolution.yml

@@ -91,7 +91,7 @@ EAGLEChemistry:              # Solar abundances
   init_abundance_Iron:       0.0
 
 EAGLEFeedback:
-  filename:     /cosma5/data/Eagle/BG_Tables/YieldTables/
+  filename:     ./yieldtables/
   imf_model:    Chabrier
   continuous_heating_switch: 0
   SNIa_timescale_Gyr:        2.0