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/cmake/FindCBLAS.cmake

@@ -0,0 +1,34 @@
+# include(FindLibraryWithDebug)
+
+if (CBLAS_INCLUDES AND CBLAS_LIBRARIES)
+  set(CBLAS_FIND_QUIETLY TRUE)
+endif (CBLAS_INCLUDES AND CBLAS_LIBRARIES)
+
+find_path(CBLAS_INCLUDES
+  NAMES
+  cblas.h
+  PATHS
+  $ENV{CBLASDIR}/include
+  ${INCLUDE_INSTALL_DIR}
+)
+
+find_library(CBLAS_LIBRARIES
+  cblas
+  PATHS
+  $ENV{CBLASDIR}/lib
+  ${LIB_INSTALL_DIR}
+)
+
+find_file(CBLAS_LIBRARIES
+  libcblas.so.3
+  PATHS
+  /usr/lib
+  $ENV{CBLASDIR}/lib
+  ${LIB_INSTALL_DIR}
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(CBLAS DEFAULT_MSG
+                                  CBLAS_INCLUDES CBLAS_LIBRARIES)
+
+mark_as_advanced(CBLAS_INCLUDES CBLAS_LIBRARIES)