Add story.tmpl from base-jinga (commit 6c39636)
Moved back partials from partials/ dir into templates, so that they are correctly found by the rendering code

Renamed partials from .tmpl to .partials to distinguish them from layout oens
Move code non layout code to story.partial
Update included names
Just empty lines
Remove the call to get_post_data because that's now handled in core
Pass messages function around because there aren't no more "with context" imports
Adapt base template to post dict