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/libs/f77/data.f

@@ -0,0 +1,14 @@
+      SUBROUTINE DATA(A,X,N)
+**
+**    X = AT * A
+      REAL*8 A(N,N),X(N,N),R
+      DO 20 I=1,N
+      DO 20 J=1,N
+         R=0.
+         DO 10 K=1,N
+            R=R+A(K,I)*A(K,J)
+   10    CONTINUE
+         X(I,J)=R
+   20 CONTINUE
+      RETURN
+      END