CLIENTWINDOW tokenizedRedirect should ignore ctrl-key

When in CLIENTWINDOW-mode it would be nice if the user is holing down the ctrl-key and clicks a link (get-request link), the DeltaSpike onclick-handler is not being executed, as the user wants this link to be opened in a new tab and a new window-id will be assigned due to the window-name check anyway. Now we have to right-click the link and choose "Open in new tab" to get the desired behaviour, but lots of people are used to open new windows by holding the ctrl-key.
This also applies to links with a target="_blank" as those should always open in a new tab and the DS onclick-handler could probably be ignored.

This should of course not affect links with ajax-functionality, e.g. p:commandLink oder f:ajax(ified) links, as they cannot easily be opened in a new window.