imported a reworked version of BTL (Benchmark for Templated Libraries).

the modifications to initial code follow:
* changed build system from plain makefiles to cmake
* added eigen2 (4 versions: vec/novec and fixed/dynamic), GMM++, MTL4 interfaces
* added "transposed matrix * vector" product action
* updated blitz interface to use condensed products instead of hand coded loops
* removed some deprecated interfaces
* changed default storage order to column major for all libraries
* new generic bench timer strategy which is supposed to be more accurate
* various code clean-up

bench/btl/generic_bench/utils/size_log.hh

@@ -0,0 +1,54 @@
+//=====================================================
+// File   :  size_log.hh
+// Author :  L. Plagne <laurent.plagne@edf.fr)>        
+// Copyright (C) EDF R&D,  lun sep 30 14:23:17 CEST 2002
+//=====================================================
+// 
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+// 
+#ifndef SIZE_LOG
+#define SIZE_LOG
+
+#include "math.h"
+// The Vector class must satisfy the following part of STL vector concept :
+//            resize() method
+//            [] operator for seting element
+// the vector element are int compatible.
+template<class Vector>
+void size_log(const int nb_point, const int size_min, const int size_max, Vector & X)
+{
+  X.resize(nb_point);
+
+  float ls_min=log(float(size_min));
+  float ls_max=log(float(size_max));
+
+  float ls=0.0;
+
+  float delta_ls=(ls_max-ls_min)/(float(nb_point-1));
+
+  int size=0;
+
+  for (int i=0;i<nb_point;i++){
+
+    ls = ls_min + float(i)*delta_ls ;
+    
+    size=int(exp(ls)); 
+
+    X[i]=size;
+  }
+
+}
+
+
+#endif