initial checkin of new LocalInterp thorn

git-svn-id: http://svn.cactuscode.org/arrangements/CactusBase/LocalInterp/trunk@2 df1f8a13-aa1d-4dd4-9681-27ded5b42416

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+Cactus Code Thorn LocalInterp
+Authors    : Jonathan Thornburg,
+             incorporating parts of the old PUGHInterp by Thomas Radke,
+             which in turn draws on older code by Paul Walker and
+             optimization ideas from Erik Schnetter
+CVS info   : $Header$
+--------------------------------------------------------------------------
+
+Purpose of the thorn:
+
+This thorn does processor-local interpolation of N-dimensional data
+arrays.  In general there may be many input arrays (all defined on the
+same uniform Cartesian grid) all being interpolated to the same set
+of interpolation points.
+
+This thorn actually packages together two separate local interpolators:
+* One written by Thomas Radke in early 2001, with the operators
+  "first order uniform cartesian", "second order uniform cartesian",
+  and "third order uniform cartesian", all registered under the
+  CCTK_InterpLocal() interpolation API.  (This formerly lived in
+  the PUGHInterp thorn, but turned to have very little to do with
+  PUGH, so it's been moved here.)  This lives in the subdirectory
+  src/UniformCartesian/ .
+* One written by Jonathan Thornburg in winter 2001-2002, with the
+  operator "generalized polynomial interpolation" registered under
+  the CCTK_InterpLocalUniform() interpolation API.  This lives in
+  the subdirectory src/GeneralizedPolynomial-Uniform/ .
+
+We plan to eventually phase out the CCTK_InterpLocal() API.  We may
+also phase out its interpolator, or we may move this to the newer
+CCTK_InterpLocalArrays() API.