- fixed_size::tensor::contraction: fixes and an additional test
multidim::io(layout): add some output
multidim::io(slice_layout): add some output
multidim::replace_strides: add parameter for new stride vector (with default)
tensor::contraction: use compact layout for contraction array-type
tensor::interface: enable copy constructor for compatible types only
multidim::remove_index(layout/slice_layout): add tests
comments and io cosmetics