Fix bug 623: inlining test_is_equal leads to failures with x87
Bug 626: add compiletime check of the Options template parameter of SparseMatrix and SparseVector. Fix eval and plain_object for sparse objects.
Fix bug 626: add assertion on input ranges for coeff* and insert members for sparse objects
Fix bug 611: fix const qualifier in cwiseProduct(sparse,dense) and SparseDiagonalProduct::InnerIterator