- Google style docstrings use `Args:` and not `Arguments:`
- Stick to markdown *everywhere*.
- The first line in a big docstring `"""` is always a one line summary

Please confirm before I merge :).

Version 2020.4 with bug fixes to retrieve time better from omni and also works with `share/Python/Scripts/prepare_geospace.py`

This reverts commit 0e2d5042.

Version 2020.1. Changed download_magnetogram_hmi to take a new argument for either B_720s or b_synoptic_small which is needed.

Removed DOCUMENTATION link because it is not quite ready.
Readability changes.