Speed improvements for ECAL multifit

Roughly 30% faster in offline mode on a Xeon X5650. 
There is probably room for more speedup but it will require substantial work.
Not a factor of 10 but it's something.

Main sources of improvement are:
- turning off debug for Eigen :-)
- removing use of eigen "views" that seems to not work. Should probably report to eigen people.

There are a few places where non-unrollable views are used because of the eigen interface, but that's life.

No differences expected/observed.

@VinInn @bendavid 
Since the max number of pulses is currently defined at configuration level, this can only happen if the producer is misconfigured (ie the configuration specifies more than 10 bunch crossings)