Added a EAGLE-25 DMONLY test case.

examples/EAGLE_DMO_25/README

+ICs extracted from the EAGLE suite of simulations. 
+
+WARNING: The ICs are 1.6GB in size. They contain ~53M DM particles.
+
+The particle distribution here is the snapshot 27 (z=0.1) of the 25Mpc
+DMONLY-model. h- and a- factors from the original Gadget code have been
+corrected for. Variables not used in a pure gravity code have
+been removed.  Everything is ready to be run without cosmological
+integration.
+
+The particle load of the main EAGLE simulation can be reproduced by
+running these ICs on 8 cores.
+
+MD5 checksum of the ICs: 
+78660ea7a8d4dc4c4220566caa30a08e  EAGLE_DMO_ICs_25.hdf5

examples/EAGLE_DMO_25/eagle_25.yml

+# Define the system of units to use internally. 
+InternalUnitSystem:
+  UnitMass_in_cgs:     1.989e43      # 10^10 M_sun in grams
+  UnitLength_in_cgs:   3.085678e24   # Mpc in centimeters
+  UnitVelocity_in_cgs: 1e5           # km/s in centimeters per second
+  UnitCurrent_in_cgs:  1             # Amperes
+  UnitTemp_in_cgs:     1             # Kelvin
+
+# Cosmological parameters
+Cosmology:
+  h:              0.6777        # Reduced Hubble constant
+  a_begin:        0.9090909     # Initial scale-factor of the simulation
+  a_end:          1.0           # Final scale factor of the simulation
+  Omega_m:        0.307         # Matter density parameter
+  Omega_lambda:   0.693         # Dark-energy density parameter
+  Omega_b:        0.0455        # Baryon density parameter
+
+# Parameters governing the time integration
+TimeIntegration:
+  time_begin: 0.    # The starting time of the simulation (in internal units).
+  time_end:   1e-2  # The end time of the simulation (in internal units).
+  dt_min:     1e-10 # The minimal time-step size of the simulation (in internal units).
+  dt_max:     1e-3  # The maximal time-step size of the simulation (in internal units).
+  
+Scheduler:
+  max_top_level_cells:    20
+  
+# Parameters governing the snapshots
+Snapshots:
+  basename:            eagle_dmo
+  scale_factor_first:  0.92  # Scale-factor of the first snaphot (cosmological run)
+  time_first:          0.01  # Time of the first output (non-cosmological run) (in internal units)
+  delta_time:          1.10  # Time difference between consecutive outputs (in internal units)
+  compression:         4
+
+# Parameters governing the conserved quantities statistics
+Statistics:
+  scale_factor_first:  0.92 # Scale-factor of the first stat dump (cosmological run)
+  time_first:          0.01 # Time of the first stat dump (non-cosmological run) (in internal units)
+  delta_time:          1.05 # Time between statistics output
+
+# Parameters for the self-gravity scheme
+Gravity:
+  eta:                    0.025     # Constant dimensionless multiplier for time integration.
+  theta:                  0.85      # Opening angle (Multipole acceptance criterion)
+  comoving_softening:     0.0026994 # Comoving softening length (in internal units).
+  max_physical_softening: 0.0007    # Physical softening length (in internal units).
+
+# Parameters related to the initial conditions
+InitialConditions:
+  file_name:  EAGLE_DMO_ICs_25.hdf5
+  cleanup_h_factors: 1                 # Remove the h-factors inherited from Gadget

examples/EAGLE_DMO_25/getIC.sh

+#!/bin/bash
+wget http://virgodb.cosma.dur.ac.uk/swift-webstorage/ICs/EAGLE_DMO_ICs_25.hdf5

examples/EAGLE_DMO_25/run.sh

+#!/bin/bash
+
+ # Generate the initial conditions if they are not present.
+if [ ! -e EAGLE_DMO_ICs_25.hdf5 ]
+then
+    echo "Fetching initial conditions for the EAGLE DMO 25Mpc example..."
+    ./getIC.sh
+fi
+
+../swift -c -G -t 16 eagle_25.yml 2>&1 | tee output.log
+