tmf: Add a copy method to state system inputs

tmf: Add a copy method to state system inputs

This is another requirement for partial histories. It is not a
real "clone" method, since we do not want to copy the assigned
state system at that moment, it's supposed to be assigned later
with another call to assignTargetStateSystem().

Change-Id: I744030084fc968b6426718c2fac5ace7f1a2c6dc
Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-on: https://git.eclipse.org/r/10756
Tested-by: Hudson CI
IP-Clean: Bernd Hufmann <bhufmann@gmail.com>
Tested-by: Bernd Hufmann <bhufmann@gmail.com>