[eigen] TriangularView::solve() interface |

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Hello,

`While rewriting part of the tutorial, I noticed that the new
``TriangularView::solve() function returns the solution vector, while the
``other solve functions pass the solution via one of the parameters. Compare
`
x = A.triangularView<UpperTriangular>().solve(b);
with
A.partialLu().solve(b, &x);
Was this done on purpose?

`The docs on the eigen website [1] were magically updated, but some of the
``latex was not parsed correctly. Am I doing anything wrong? Everything
``works fine on my own computer.
`
[1] http://eigen.tuxfamily.org/dox-devel/TutorialAdvancedLinearAlgebra.html

`Something to perhaps add to the to-do list: a routine to estimate the
``condition number of a matrix based on the LU decomposition.
`
Cheers,
Jitse