Multiple additions + forward parameterisation + mvl addons

[preghenella]

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[preghenella]

@njacazio please have a look.
@marcovanleeuwen I merged your development from your fwdpara branch locally, fixed some conflicts that originated from parallel development and this should be how it goes into the DelphesO2 repo. thanks

[preghenella]

I actually notice that is does not work, there was a piece I missed.
will fix it, sorry, coming back soon

[preghenella]

@njacazio
a new way to defined the efficiency is encoded in the LUT in the eff2 member.
a method has been added to the TrackSmearer to decide which efficiency to be used setWhatEfficiency.
by default we use the old efficiency definition, but this might change

[njacazio]

Ciao @preghenella very large amount of work. I'm fine with the changes!

[preghenella]

ok thanks @njacazio
I merge it. hopefully we will manage to test it ;)