More validation for page configurations:
- Check that the category is not an array.
- Make sure the tags are an array, and no slashes in them.
Added some debug printing for the baker.
Better bake test.
Fixed filtering handling of tag slufigication. Yeah, you read that right.
One less nested iterator in pagination.
Added garbage collection to `PageRepository`.
Fix handling of tags/categories with diacritics and invalid characters.
Added a log available for PieCrust core sub-systems.
The `PageRepository` can log information about garbage collecting pages.
Display a warning to the user about the change in multi-tags syntax.