Convert daughters branches into double precision

[l-cadamuro]

Float precision used for daughters_ branches (and maybe mothers_ as well) causes the mass values computed downstream using TLorentzVector to be different from the original value.
Probably not an issue because nobody uses the mass as a variable, but appears as differences in the synchronization. Note that this does not affect SVFit computation.
To be changed to double after the rest of the downstream codes are ready to handle vectors of doubles.

[francescobrivio]

Spent some time today trying to understand why the mass of the daughters was not as the original value in miniAODs, I see you already knew since 4 years @l-cadamuro :) I'll leave this open in the hope that we will find time to update the downstream code in the near future!