Update foresee sample config to 13.6 TeV and add ability to sample hists in 1 or 2D
Two changes:
- Updated foresee config to ECoM = 13.6 TeV
- Allow sampling energy with 1D hist or energy vs theta with 2D hist via 1D: --sampler hist --hist_name filename.root:histname 2D: --sampler hist2D --hist_name filename.root:histname --angle None