Fix installation path of SparseQR
SparseQR: clean a bit the documentation, fix rows/cols methods, remove rowsQ methods and rename matrixQR to matrixR.
Clean inclusion, namespace definition, and documentation of SparseLU
Cleaning documentation pass in ordering and ILUT
Fix bug 540: SelfAdjointEigenSolver improperly used the upper triangular part to extract the scaling factor.
Remove TOC numbering, and minor improvement in overview.