remove casts to SmartInterface - we know that our document implements it
remove casts to SmartInterface - we know that our document implements it

svn path=/trunk/KDE/kdelibs/kate/; revision=1086178

hlamer/kate,cmacq2/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,sandsmark/kate,hlamer/kate,hlamer/kate,jfmcarreira/kate,sandsmark/kate,sandsmark/kate,DickJ/kate,sandsmark/kate,jfmcarreira/kate,cmacq2/kate,DickJ/kate,jfmcarreira/kate,DickJ/kate,hlamer/kate,hlamer/kate,DickJ/kate,cmacq2/kate,hlamer/kate