New cell time cut in cluster making
We have added a time cut on calorimeter cells at cluster making stage. The cut is controlled by a flag, currently switched OFF by default. A first version of the time cut has been already merged into 21.0 some time ago (included in 21.0.62 and later). The first version only acted on seed cells, preventing them from seeding a cluster if the cell time exceeds 12.5 ns in absolute value. We have then studied an extended version of the cut, in which seed cells failing the time cut are also prevented from being included into existing clusters (e.g. as neighbouring cells). This MR implements the latter version, in addition to the existing seed-only cut. Two flags are in place, so it is possible to choose either one or the other version of the time cut. Having a the code merged would allow other users and/or developers to independently derive samples with the time cut on, in order to finalise its study.