sim_fibo_ad: convert to the new-style wells manager

i.e. it now uses Opm::EclipseState. This change required to re-add the
the epoch concept in some sense, but the loop variables now call it
"episode" which sounds less ethernal IMO.
sim_fibo_ad: fix writing

the initial condition was written multiple times. We now fix this by
not writing anything in the simulator and moving this logic to the
main loop..
Merge pull request #101 from andlaus/sim_fibo_ad_use_new_wellmanager

sim_fibo_ad: convert to the new-style wells manager