move eigen values related stuff of the QR module to a new EigenSolver module.

- perhaps we can find a better name ?
- note that the QR module still includes the EigenSolver module for compatibility

Eigen/QR

@@ -24,11 +24,9 @@ namespace Eigen {
   *
   * \nonstableyet
   *
-  * This module mainly provides QR decomposition and an eigen value solver.
+  * This module provides various QR decompositions
   * This module also provides some MatrixBase methods, including:
   *  - MatrixBase::qr(),
-  *  - MatrixBase::eigenvalues(),
-  *  - MatrixBase::operatorNorm()
   *
   * \code
   * #include <Eigen/QR>
@@ -38,22 +36,10 @@ namespace Eigen {
 #include "src/QR/HouseholderQR.h"
 #include "src/QR/FullPivotingHouseholderQR.h"
 #include "src/QR/ColPivotingHouseholderQR.h"
-#include "src/QR/Tridiagonalization.h"
-#include "src/QR/EigenSolver.h"
-#include "src/QR/SelfAdjointEigenSolver.h"
-#include "src/QR/HessenbergDecomposition.h"
-#include "src/QR/ComplexSchur.h"
-#include "src/QR/ComplexEigenSolver.h"
 
 // declare all classes for a given matrix type
 #define EIGEN_QR_MODULE_INSTANTIATE_TYPE(MATRIXTYPE,PREFIX) \
   PREFIX template class HouseholderQR<MATRIXTYPE>; \
-  PREFIX template class Tridiagonalization<MATRIXTYPE>; \
-  PREFIX template class HessenbergDecomposition<MATRIXTYPE>; \
-  PREFIX template class SelfAdjointEigenSolver<MATRIXTYPE>
-
-// removed because it does not support complex yet
-//  PREFIX template class EigenSolver<MATRIXTYPE>
 
 // declare all class for all types
 #define EIGEN_QR_MODULE_INSTANTIATE(PREFIX) \
@@ -76,4 +62,7 @@ namespace Eigen {
 
 #include "src/Core/util/EnableMSVCWarnings.h"
 
+// FIXME for compatibility we include EigenSolver here:
+#include "EigenSolver"
+
 #endif // EIGEN_QR_MODULE_H