Thomas Purdy

add cooking for blockheads sink as an icon

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### Role labelling custom packs ### Suggestion add a kitchen sink icon to default icon list ### Benefit I want to label my kitchen sink modpacks with a kitchen sink...

This is going to break all our examples, but I'll go back over them once rewrite is merged.

Rewrite refactor

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Completely rewrote rewrite DSL, added many tests.

This breaks rewrite tests, but I'll fix that after rewrite is merged

Causal loop compose

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Composition now works with causal loop diagrams.

Stock and Flow with units

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May want to make a few more tests.

Update Project.toml

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Increment Catlab version max to 0.16.8 and AlgebraicRewriting to 0.3.2

Added a few functions for simple constants (eg, x + 1, 1/x, etc). Th…

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…eir definitions are seen in visualization. Dyvars can now have arbitrarily many operators, similar to flow dyvars.

Stockflows without foot are now coproducted with the rest, rather tha…

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…n using empty foot. This results in a more accurate UWD, and you are now allowed to specify empty foot composition.