* Added `after` attribute on `Column` to enable custom column ordering (See `tri.declarative.sort_after()`)
* Enable mixing column definitions in both declared fields and class meta.
* Don't show any results if the form is invalid
1.13.0
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* Add python 3 support
1.12.0
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* Changed syntax for specifying html attributes and classes. They are now use the same way of addressing as other things, e.g.: Column(attrs__foo="bar", attrs__class__baz=True) will yield something like `<th class="baz" foo=bar>...</th>`
1.11.0
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* Fix missing evaluation of row__attr et al.
1.10.0
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* Changed cell__template and row__template semantics slightly to enable customized cell ordering in templates.
row__template implementations can now access a BoundCell object to use the default cell rendering.
cell__template implementation are now assumed to render the <td> tags themself.