This MR fixes the issue of late calls to update in DOFVectorTest and ProblemStat.inc

basis.update(gv) needs to be called after a change to the grid and before the basis is used again. Since GridTransferManager::adapt() handles calls to [pre/post]adapt(), it is required to have access to non-const instances of the involved bases and to call update on them.

Note: branch feature/global_refine currently uses calls to

    adapted |= GridTransferManager::adapt(*grid_);
    globalBasis_->update(gridView());

With this MR those need to be replaced by

    adapted |= GridTransferManager::adapt(*grid_, *globalBasis_);