Changing default Riemann projection scale to auto

[hubertjb]

@dengemann if I remember correctly the default scale for Riemann projection had to be changed from 1 to 'auto'.

[dengemann]

not sure we finished discussing this topic. there is still something to understand as this rescaling shouldn't be necessary, in principle.

[agramfort]

what is the scale parameter doing?

[dengemann]

remember it normalises covariances by trace (total power)

[dengemann]

Thanks a lot @agramfort you make my day. Any HTML output to share?