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* Fixed an issue where fragments couldn't be customized later if built with the `html` builder
* `Action` inherits from `Fragment`. This should be mostly transparent.
* You can now pass multiple argument to `Fragment`/`html.foo()`. So `html.div('foo', 'bar')` is now valid and creates two child nodes `child0` and `child1`
* Uncouple `auto__*` from `row` parameter. `auto__` only suggests a default. This avoids some confusion one could get if mixing `auto__rows`, `auto__models` and `rows` in some ways.
* Fixed setting active on nested submenus where the parent had url None