Aggregates, patch broadcasting, and refactoring

[d-chambers]

Description

This is a large PR which implements a few significant changes/improvements:

1. Adds shortcuts for common patch aggregations (min, max, std, etc.)
2. Implements patch broadcasting and sub-selection when applying operations
   • Operations can now be applied to patches of different shapes but shared, or broadcastable, dimensions
3. Support for non-coordinate dimensions
4. Adds the ability to use arrays in Patch.select
5. A new method Patch.order which behaves like dataframe.loc
6. Fixed a few small deprecations from external libraries and bugs with the time utils.

TODO

• [x] Add spool.concat method
• [ ] Add concat to docs
• [x] Add order to docs
• [x] Add examples of non-coord dimensions in Patch and Coordinate section of docs
• [x] Add order and select docs, be sure they reference each other
• [x] Add example of appending and re-arranging dims in docs

Checklist

I have (if applicable):

• [ ] referenced the GitHub issue this PR closes.
• [ ] documented the new feature with docstrings or appropriate doc page.
• [ ] included a test. See testing guidelines.
• [ ] your name has been added to the contributors page (docs/contributors.md).
• [ ] added the "ready_for_review" tag once the PR is ready to be reviewed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.83%. Comparing base (e206fc2) to head (d39605e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #375 +/- ## ========================================== + Coverage 99.60% 99.83% +0.23% ========================================== Files 105 106 +1 Lines 8050 8625 +575 ========================================== + Hits 8018 8611 +593 + Misses 32 14 -18 ``` | [Flag](https://app.codecov.io/gh/DASDAE/dascore/pull/375/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DASDAE) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/DASDAE/dascore/pull/375/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DASDAE) | `99.83% <100.00%> (+0.23%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DASDAE#carryforward-flags-in-the-pull-request-comment) to find out more.

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