Skin updates:

Skin updates:
* Add 'pagetitle' message to customize the HTML page title format (eg, "$1 - Wikipedia Encyclopedia")
* Some XHTML fixes to Nostalgia skin, prefs
* Removing the unfinished Smarty skins, renamed Standard to Classic
* Remove "gnunote" message in favor of general "copyright" msg, which is filled with the link & name in $wgRightsPage/$wgRightsURL and $wgRightsText
* Support a copyright-related icon as $wgRightsIcon (includes sample gnu-fdl.png)
* Show "Powered by MediaWiki" icon in footer (poweredby_mediawiki_88x31.png by Dan Carlson)