Permutation t-test'ed Coherence NxN Fc graph

[Francois]

Thanks for the example file.
I fixed two bugs related with the display of this type of file (stat on coherence): https://github.com/brainstorm-tools/brainstorm3/commit/28b26037369dd8a8426b7a375e76a11f2bd50994

Please update Brainstorm and try again.