Convert base_linear_op to a dense linear operator in BlockDiagLinearOperator#119

Balandat merged 2 commits intocornellius-gp:maincornellius-gp/linear_operator:mainfrom

kayween:fix-block-diag-linear-operator-diagonalkayween/linear_operator:fix-block-diag-linear-operator-diagonalCopy head branch name to clipboard