ccg: do not import matplotlib by default
ccg: do not import matplotlib by default

(it import it's own qt version that can conflict with our)

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