Nyall Dawson f649f1f8a7 [layouts][needs-docs] Add control for whether pages should be
exported, including data defined setting

This replaces the 2.x data-defined "number of pages" setting.
Instead of requiring users to develop an expression to return
the number of pages, instead we allow individual pages to have
a data defined control of whether that page should be included
in the export.

This is more flexible, and works correctly with the mixed page
size model for layouts.
2017-12-17 14:14:48 +10:00
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