Struct improvements

Some improvements and simplifications to the Struct class. Should be uncontroversial.

added 18 commits

• 19b69c68...364d4127 - 18 commits from branch gwinc:master

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added 6 commits

• 5db7341c - struct: fix comment
• 95c59e8d - struct: add Struct equality magic method
• 9789e84a - struct: set default=None in Struct.get method
• 8157f820 - struct: fix yaml loader
• 6f23e345 - struct: Struct improve initialization signature to be more dict-like
• 50f81132 - struct: Struct incorporate all load_struct functionality

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This no longer depends on any other merge requests. Hopefully it can get a review, but it's pretty straightforward improvements so I will push soon regardless.

added 1 commit

• 83cd7583 - struct: Struct incorporate all load_struct functionality

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approved this merge request

Sitting with @christopher.wipf, who approves.

merged