* remove set(), revert to old behavior where = resizes

* try to be clever in matrix ctors and operator=: be lazy when we can, always allow
  to copy rowvector into columnvector, check the template parameters,
  try to factor the code better
* add missing copy ctor in UnalignedType
* fix bug in the traits of DiagonalProduct
* renaming: EIGEN_TUNE_FOR_CPU_CACHE_SIZE
* update the dox a little

Eigen/src/Core/Transpose.h

@@ -175,7 +175,7 @@ struct ei_inplace_transpose_selector<MatrixType,false> { // non square matrix
     if (m.rows()==m.cols())
       m.template part<StrictlyUpperTriangular>().swap(m.transpose());
     else
-      m.set(m.transpose().eval());
+      m = m.transpose().eval();
   }
 };
 
@@ -186,7 +186,7 @@ struct ei_inplace_transpose_selector<MatrixType,false> { // non square matrix
   * then this "in-place" version is probably the right choice because it provides
   * the following additional features:
   *  - less error prone: doing the same operation with .transpose() requires special care:
-  *    \code m.set(m.transpose().eval()); \endcode
+  *    \code m = m.transpose().eval(); \endcode
   *  - no temporary object is created (currently only for squared matrices)
   *  - it allows future optimizations (cache friendliness, etc.)
   *