Release 0.19.6

[johanjanssens]

1. Improve layout API #540

The layout API has been improved to increase re-usability and decrease coupling. It also adds a new layout()template function to get easy access to the merged layout properties.

The way layout properties work has also been improved . Before layout properties were merged during the layout rendering process, now layout properties are merged before the page is rendered so all the layout properties defined in the different inherited layouts are accessible in the page. For more info check the PR #540

2. Allow to override the database identity key #535

Added support for overriding the database table identity key through the extension config identity_key option.

Fixes

• Fix error report line mismatch Fix error report line mismatch #549
• Notice in cacheable if the page no longer exists Notice in cacheable if the page no longer exists #538
• Decorator is not working Decorator is not working #533