Add support for MMB clicks on back/forward, up and home toolbar icons.
Also works in the back/forward dropdown menus and in the go menu. Either opens a new tab or a new window. NewTabInFront and the Shift button determine wheter the new tab is in front. Tabs openend by back/forward and up respect openAfterCurrentTab, Home not. The history is copied for back and forward. (And Ctrl+Left support.) svn path=/trunk/kdebase/konqueror/; revision=379899
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