* Improve markup.
* Improve filter and test guides by linking to plugins and using FQCNs more consistently.
* list_merge is an option, not the filter's name.
* Improve filter docs.
* Update docs. Split fiter_guide.rst to files per sections.
* Fix docs.
* Update docs. Split filter_guide_abstract_informations.rst to files per sections.
* Create section 'Merging lists of dictionaries' from the template in helper/lists_mergeby.
* Fixed indentation. Comments and notes added.
* Revert "Fixed indentation. Comments and notes added."
This reverts commit 0f38450868.
* Revert "Create section 'Merging lists of dictionaries' from the template in helper/lists_mergeby."
This reverts commit 5b9d01ec2d.