Timemanager now makes shure to write an output when arriving at the last...

Timemanager now makes shure to write an output when arriving at the last timestep, regardless of shouldWriteOutput()

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@4874 2fb0f335-1f38-0410-981e-8018bf24f1b0