Allow cutting spikes in _subset_spikes_per_cluster().
Allow cutting spikes in _subset_spikes_per_cluster().

nippoo/phy,rossant/phy,nippoo/phy,kwikteam/phy,rossant/phy,rossant/phy,kwikteam/phy,nsteinme/phy,nsteinme/phy,kwikteam/phy