Update to make AliFMDParameters::Init return error code

Update to make AliFMDParameters::Init return error code
rather than dumping out with AliFatal.  Also check on
each Init whether the run number was the same as on the
previous call.  This allows us to have long-running clients
using the parameters - e.g., the DQM agents.

If parameters fail to load, we turn the reconstructor into a
zombie, and if this is a zombie, we do nothing in the sub-sequent
calls.   Note, a new AliFMDParameters::Init that succeeds will clear
this zombie state and bring the reconstructor back as Lazarus.