Add new study: Pate_1990

[yangsophieee]

Add study on growth and storage traits of post-fire seedlings in Mediterranean ecosystems of south-western Australia. I originally transcribed it in long format because that was easiest, but I changed it into wide format (see Pate_1990_extra_R_code.R) because there were some warning messages associated with it being in long format.

Questions for review:

• If retired, do I leave affiliation blank?
• There's 4 sites but they don't have site-level data so I've just assigned all of them to a broad site in south-western Australia
• A few taxonomic updates needed

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4c5ca8e) 80.20% compared to head (0ebc397) 80.20%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #726 +/- ## ======================================== Coverage 80.20% 80.20% ======================================== Files 7 7 Lines 1531 1531 ======================================== Hits 1228 1228 Misses 303 303 ```

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