Last few tweaks to the quickstart & advanced-analysis tutorial

[ismael-mendoza]

This PR will adjust the following two notebooks so they are ready to be released alongside the BTK paper:

• [x] quickstart
• [x] advanced-analysis

In advanced-analysis, I'm also tidying up the plots to be "paper-ready". Other todo items:

• [x] investigate some of the warnings raised by advanced-analysis or understand why they happen.

In the end, when looking into the above to-do item I discovered some bugs in the matching procedure. So I'm fixing them here too.

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Codecov Report

Attention: Patch coverage is 24.07407% with 41 lines in your changes are missing coverage. Please review.

Project coverage is 62.76%. Comparing base (180bf61) to head (cead309).

:exclamation: Current head cead309 differs from pull request most recent head 655ce30. Consider uploading reports for the commit 655ce30 to get more accurate results

Files	Patch %	Lines
btk/match.py	33.33%	22 Missing :warning:
btk/measure.py	13.33%	13 Missing :warning:
btk/deblend.py	0.00%	5 Missing :warning:
btk/plotting.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #477 +/- ## ========================================== - Coverage 63.90% 62.76% -1.14% ========================================== Files 19 19 Lines 1568 1598 +30 ========================================== + Hits 1002 1003 +1 - Misses 566 595 +29 ``` | [Flag](https://app.codecov.io/gh/LSSTDESC/BlendingToolKit/pull/477/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/LSSTDESC/BlendingToolKit/pull/477/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC) | `62.76% <24.07%> (-1.14%)` | :arrow_down: | 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=LSSTDESC#carryforward-flags-in-the-pull-request-comment) to find out more.

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