Outlinks reports used to exlude Alias URLs automatically.
But I now see that on the demo: http://demo.piwik.org/index.php?module=CoreHome&action=index&idSite=1&period=day&date=yesterday#module=Actions&action=getOutlinks&idSite=1&period=day&date=yesterday
this is not the case anymore (de. dev. and forum. are registered as outlinks to this website ID).
We should fix it + add integration test
(In [4456]) Fixes #2009 Now clicks on Alias URLs domains will be ignored as expected