Add new study: Sweedman_2006

[ehwenk]

• add study - seed germination data from Kings Park, WA botanic garden
• data extracted from pdf
• I'm including seed germination treatment as both a trait and as a context, since it is a context for germination time
• means we need to add a new trait to APD...

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d2d408e) 80.20% compared to head (91be1b8) 80.20%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #723 +/- ## ======================================== Coverage 80.20% 80.20% ======================================== Files 7 7 Lines 1531 1531 ======================================== Hits 1228 1228 Misses 303 303 ```

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