LDLT: Report sign consistent with D for indefinite matrices.
See http://forum.kde.org/viewtopic.php?f=74&t=106942
Use EISPACK's strategy re max number of iters in Schur decomposition (bug 479).
Allow user to specify max number of iterations (bug 479).
Add a RealQZ class: a generalized Schur decomposition for real matrices
 working version of sparse LU with unsymmetric supernodes and fill-reducing permutation
real QZ: update license
RealQZ: optimize general hessenberg to not apply rotations to zero entries.
do not apply plane rotation when it is exactly the identity
Fix aliasing issue in sparse matrix assignment.
(m=-m; or m=m.transpose(); with m sparse work again)
Add static assert that objects on stacks are not too big (bug 491).
Add a draft (not clean ) version of the COLAMD ordering implementation
Add exception handler to memory allocation
correct bug in the complex version
RealQZ: bug in splitOffTwoRows fixed
RealQZ: bug in pushDownZero fixed too
SparseMatrix: add missing ctor for ReturnByValue
RealQZ: improve computeNorms speed, improve shift accuracy (better to do a/b than a*(1/b)),
        update API to set the maximum number of iterations
RealSchur: improve speed of computeNormOfT
Add a preliminary GeneralizedEigenSolver computing the eigenvalues of Av=lBv with A and B general real matrices.
Currently only the eigenvalues are reported.
Refactoring codes for numeric updates