zii: jQuery UI documentation links updated (jqueryui.com links were changed after their site update).
zii widgets: API and demo page links in the PHPDocs are now clearly separated and explicitly described.
Merge pull request #1963 from resurtm/JUI-links

zii: jQuery UI documentation links updated
[ci skip]
Fixes #1763 CSqlDataProvider order by bug
Merge pull request #1970 from szako/1763-CSqlDataProvider-order-by-bug

Fixes #1763 CSqlDataProvider order by bug