Implemented most all of the tabs features.
Added filter to permissions page.
Initial Drupal 8 update.
Issue #2141121 by shumushin: Initial D8 port
Issue #2452067 by Madis: Option to show description expanded as default not working
Issue #2580791 by makbul_khan8: Coding standards and few function without help comments
Issue #2153697 by annya: Disabling option "Number of enabled modules" breakes tabs functionality
Issue #1710230 by willvincent: On | Off buttons does not change state with jquery_update module active
Prep CHANGELOG for push to 7.x-2.x.
Improved logic for version showing within own column or within description column.
Let the entire td.description element be clickable.
Added option to show description as expanded by default.
Improved description field so when it is open, interacting with it's contents does not make it collapse.
Placed collapsed/expanded images inside of module for easier, more reliable access.
Added option to place version back in own column.
Issue #2113191 by joelpittet: Category tabs not working
Simplifying the table rows by hiding version and requirements until a particular description is clicked.
Issue #2235553 by greenSkin: Fixed latest jquery_update breaks module filter.
Issue #2303379 by jobjol: Category of module_filter.
Issue #2304687 by mpdonadio: Fixed Remove hardcoded operations.
Issue #2293029 by topsitemakers: Fixed Take header offset into account when selecting a tab.
Issue #2290213 by topsitemakers: Fixed Minor typo in description - "has no affect" -> "has no effect".
#2141743, #2141743 by greenSkin: Fixed issues related to the new dynamically positioned tabs and using the dynamically positioned save button.
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