df9dfa1455
This is what is needed to make Step (in KDE/kdeedu) build.
The rest of Eigen (outside of Sparse) is unaffected except for a few trivial changes that were needed.
calling this 2.0.3, will tag if no problem.
Question 1: why are *=scalar and /=scalar working right away ?
Same weirdness in DynamicSparseMatrix where operators += and -= work wihout
having to redefine them ???