media/src/binary/garnet.jpg: Add a picture of Garnet

media/src/binary/garnet.jpg: Add a picture of Garnet

The ERDC's 1.5 PFLOP cluster [1].  I can't find a bigger picture,
although I would have expected some sort of flashy PR bit somewhere.
Fun specs [1]:

  Cray XE6 - 1.5 PFLOPS    Login Nodes         Compute Nodes
  Total Nodes              8                   4716
  Operating System         SUSE Linux          CLE
  Cores/Node               16                  32
  Core Type                AMD 64-bit Opteron  AMD Interlagos Opteron
  Core Speed               2.7 GHz             2.5 GHz
  Memory/Node              128 GBytes          64 GBytes
  Accessible Memory/Node   8 GBytes            62 GBytes
  Memory Model             Shared on node.     Shared on node.
                                               Distributed across cluster.
  Interconnect Type        Ethernet            Cray Gemini

Image from [2].

[1]: http://www.erdc.hpc.mil/hardware/index.html#garnet
[2]: http://www.erdc.hpc.mil/hardware/images/garnet.jpg