move development of EOS_Polytrope and EOS_Hybrid from Whisky to Cactus

git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinEOS/EOS_Polytrope/trunk@2 e0339e42-4067-4b95-aae0-d9cd08a24254

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+Cactus Code Thorn EOS_Polytrope
+Author(s)    : Ian Hawke
+               Frank Löffler
+Maintainer(s): Cactus team
+Licence      : LGPL
+--------------------------------------------------------------------------
+
+1. Purpose
+
+This is a "faked" polytropic equation of state. It is designed to work
+through the CactusEOS interface.
+The EoS reads Pressure = eos_k * rho ** (eos_gamma). The specific internal
+energy is given by the assumption of a perfect fluid.