remove the 'Unsupported Modules' meta module
update unsupported module documentation to be conformed with new documentation style

--HG--
rename : doc/eigendoxy_layout.xml.in => unsupported/doc/eigendoxy_layout.xml.in
Make the MatrixFunctions documentation page looks a bit better
Add a sparse QR factorization and update the elimination tree in SparseLU
Add support for sparse blueNorm
Add support for Schur decomposition of matrices in Hessenberg form
Pass a const matrix to sparseQR