Fix notify::label emmision in GtkMenuItem
Emit notify::label in GtkMenuItem also when label is changed through GtkAction. Refactor GtkMenuItem and remove duplicated code for GtkLabel creation. Reset the accel-widget back to the GtkMenuItem itself when there is no action related to the GtkMenuItem anymore. Add test for notify::label emmisions. Fixes bug 612574 - GtkMenuItem does not emit notify::label when label is changed through GtkAction.
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