Handle line breaks so that formatted components line up across multiple lines

[gwgundersen]

For example, if the terminal window is small, we might have:

[[[    0.0000    0.0000    0.0000
    0.0000    0.0000],

Rather than:

[[[    0.0000    0.0000    0.0000
       0.0000    0.0000],

This already works for 1D arrays. See _format_vector and generalize it if possible.