hubers: Add function to shift std::vectors.

Add function to shift  std::vectors by respective constant values.
Used to re-align the calorimeter.
hubers: Add funtion to generate neutral LV.

Add funtion to generate photon LV from coordinates of cluster and PV
and the cluster energy.
hubers: Add function to scale calorimeter cluster.

Add funtion to scale calorimeter cluster. In case of MC a linear energy
dependence is used. In case of RD a more complex energy and position
dependence is used. Calibrated for 2009 Primakoff data.
hubers: Add function to clean clusters.

Add function to clean clusters by filtering track association and time.
Clusters around the maximum cluster are merged into it depending on the
specified merge distance. Neccesar due to artificial cluster splitting
mainly in MC.
hubers: Add function to get maximum cluster.

Add function to get maximum cluster from std::vectors.
hubers: Add function to generate a form factor cut.

Add function to generate form factor correction. Currently hardcoded
for Nickel. Could go to cuts. SOme cleaning up of the code.
hubers: Add cut on background tracks.

Add cut on background tracks depending on momentum, zfirst and time.
hubers: Add function to get best pi0 candidate.

Add function to get best pi0 candidate. Using a combination of the
highest energetic cluster with all others.
hubers: Add mass parameter for enforceEconservation

Add mass parameter for the enforcing of the energy conservation
with a neutral particle. needed for pi0 analysis. Further cleaning
up of the code.