WIP: use npy format in spikedetekt cache.
WIP: use npy format in spikedetekt cache.

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