Merge #928

928: Pretty print fixes r=hgrecco a=crusaderky

Closes #927

**Important:** I am knowledgeable neither of LateX nor of HTML portability problems. I would like to hear from someone more experienced. The tests below are the only ones I performed. 

Manual tests, performed in latest Jupyter Notebook both Chrome and in Firefox:
```python
import pint
from IPython.display import display_html, display_latex

a = [[1, 2], [3, 4]]
display_html(pint.Quantity(a, "m^2 / s"))
display_latex(pint.Quantity(a, "m^2 / s"))
display_html(pint.Quantity(a, "oil_barrel"))
display_latex(pint.Quantity(a, "oil_barrel"))
```

Before:

![before](https://i.postimg.cc/bNSJQTsK/before.png)

After:

![after](https://i.postimg.cc/C16h8BYh/after.png)



Co-authored-by: Guido Imperiale <crusaderky@gmail.com>

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