stage dies at normalization of relative path

Since r640091, DefaultSiteTool from maven-doxia-tools tries to normalize paths, which fails, as the current plexus-utils don't handle normalization of relative paths, and the stage mojo seems to use them quite extensively.

I have attached a small testcase, a parent project with a single child, and site:stage as the default goal, so you can simply run "mvn" on the parent. Debugging this shows that FileUtils.normalize is handed a path starting in "../../".

I have also attached a patch to plexus-utils that makes FileUtils.normalize handle relative paths, but I'm not sure if this would be intended, and I can't test it, because I can't get maven use the latest snapshot of plexus-utils, even if stated as an explicit dependency of the site plugin.

See also:
http://svn.apache.org/viewvc/maven/shared/trunk/maven-doxia-tools/src/main/java/org/apache/maven/doxia/tools/DefaultSiteTool.java?r1=637431&r2=640091&diff_format=h#l72
http://fisheye.codehaus.org/browse/plexus/plexus-utils/trunk/src/main/java/org/codehaus/plexus/util/FileUtils.java