* Added support framework for multiple types of dependencies.
* Allow declaring that a dependency does not encompass the content of a
page. (By passing content => 0 to add_depends.)
- * pagecount, calendar: Use a contentless dependency, which makes these
- directives much less expensive to use, since page edits will
- no longer trigger an unnecessary update.
+ * pagecount, calendar, postsparkline, progress: Use a contentless dependency,
+ which makes these directives much less expensive to use, since page
+ edits will no longer trigger an unnecessary update.
* map: Use a contentless dependency unless show= is specified.
This makes simple maps efficient enough that they can be used on sidebars!
* inline: Use a contentless dependency in quick mode.