allow overriding of print stylesheet in SkinTemplate-based skins
As discussed with Simetrical on IRC yesterday (see http://tools.wikimedia.de/~amidaniel/chanlogs/%23mediawiki/20080505.txt, threads starting at 14:06:51 and 15:21:37), I developed a small patch for SkinTemplate (Monobook) based skins which allows to override the printing stylesheet (commonPrint.css) in own skins.
It simply adds a method getPrintCss() to SkinTemplate which returns the print stylesheet to be used. This method can then be overrided by own skin classes.
The attached patch was developed against today's HEAD and tested with an own skin on a MediaWiki 1.11.1 installation.