Shorter e-mail notation, equals to leon@ :-).
Updated Dutch translations.
Made the functions filename shorter/cleaner.
Updated Dutch translations.
Use the Orbis plugin_include() function for including files.
Moved admin files to the admin folder.
Cleaned up filenames of admin files, little shorter/cleaner.
Removed definitions which are no longer used, and move include files to top.
Improved spacing and indent.
Fixed text domain.
Lowercased 'post' method and added required 'action':
https://github.com/WordPress/WordPress/blob/master/wp-admin/options.php#L180
Added an tablenav top element.