Re-written disclaimer

- The original disclaimer violates the end tag nesting rules
- There were two different disclaimers for both languages
Applied further changes to ZipWriter

Instead of throwing an exception, you better set the date to zero, so a
date prior 1980-01-01 00:00 UTC will also be possible.
Added support for directory date
Applied small optimization

To prevent redundancy
Fixed formatting
Fixed several issues
Fixed comments
Added support for Joomla

See
http://beta.woltlab.com/index.php/Thread/3347-PasswordUtil-Erg%C3%A4nzung-f%C3%BCr-Kunena-Joomla
Update AbstractUserNotificationEvent.class.php

Permissions and options for events should be evaluated by default (may be overwritten by derived classes)

Currently notification settings for conversations are displayed even if module is disabled (not to speak about problems with my own optional notifications)
Fixes reversing .containerPadding padding

If a tabMenuContainer element has no containerPadding class, no padding needs to be reversed.
Merge branch 'master' of github.com:WoltLab/WCF
Updated CategoryEditor::create() API
Improved FileReader class and fixed issue in AttachmentPage
Fixed date fields in message sidebar
Added a slideshow

Usage: $(...).wcfSlideshow();
Merge branch 'master' of github.com:WoltLab/WCF
Added CSS for Slideshow
Updating minified JavaScript files
Fixes documentation
Improves JS-accessibility of userListItem.tpl