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Merge #1106

1106: Fix exponent superscripting in HTML r=hgrecco a=clarkgwillison

- [ ] Closes # (no issue filed)
- [x] Executed ``black -t py36 . && isort -rc . && flake8`` with no errors
- [x] The change is fully covered by automated unit tests
- [x] Documented in docs/ as appropriate
- [x] Added an entry to the CHANGES file

This PR fixes two issues with exponent rendering of decimal quantities. The first was causing units with exponents that were longer than 1 character not to superscript properly in HTML views, such as used by Jupiter, and the second was causing rendered exponents in the terminal to look less than ideal.

## HTML View
In electronics, noise density is often expressed in units of Volts per sqrt(Hertz), but prior to this change that unit rendered like so:

![image](https://user-images.githubusercontent.com/253574/83940713-0ee6d600-a79b-11ea-8467-0889b46fb311.png)

By adding brackets around the exponent in the format string, we achieve the following:

![image](https://user-images.githubusercontent.com/253574/83941036-f1b30700-a79c-11ea-870e-e457f93c919b.png)

## Terminal Pretty Print
Using the unicode dot operator instead of a plain period (.) makes decimal exponents looks slightly more natural.

Before:
```
nV/Hz⁰.⁵
```
After:
```
nV/Hz⁰⋅⁵
```

Co-authored-by: Clark Willison <clarkgwillison@gmail.com>

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Source Files on job 1771.15 (PKGS="python=3.8 numpy uncertainties")