[bug][33735] PHP syntax error in comparison in users controller (frontend). Fixes #3597
[bug][32886] Fix for running validation on disabled fields which where dynamically created. Closes #4016. Closes #2635
[lng][31549] Adjust warning message to show reason of failing to delete a folder. Closes #3704.
Content Category Meta Desc and Meta Keywords don't work
Fixes #4012
Joomla! Tracker Item [#32864](http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32864&start=0)

The meta description, meta keywords and author set in a Category are never used in the front-end when displaying a single category.

The components/com_content/views/category/view.html.php simply lacks any code whatsoever to handle these fields. This PR adds the missing code, using the same approach as the article view of com_content.
Added marking of current item for aliases

This will fix the problem with marking aliases to current page. Before this, if there are two links to one menu item in menu (on to component and one alias to that item) only one is marked as current. This is wrong, both of them point to the same position so both should be marked as current.
Fixed coding style

Two little fixes in coding style
Fixes #3911
Improve static keeping of the views
Fix bug
*le sigh*
Fixes #4014