Femc electron. photon, and pi0 benchmarks (#75)

.gitlab-ci.yml

Snakefile

benchmarks/femc_electron/Snakefile

benchmarks/femc_electron/analysis/femc_electron_plots.py

benchmarks/femc_electron/analysis/gen_particles.cxx

benchmarks/femc_electron/config.yml

benchmarks/femc_photon/Snakefile

benchmarks/femc_photon/analysis/femc_photon_plots.py

benchmarks/femc_photon/analysis/femc_photon_plots.py~

benchmarks/femc_photon/analysis/gen_particles.cxx

benchmarks/femc_photon/config.yml

benchmarks/femc_pi0/Snakefile

benchmarks/femc_pi0/analysis/femc_pi0_plots.py

benchmarks/femc_pi0/analysis/gen_particles.cxx

benchmarks/femc_pi0/config.yml