Pycortex is not compatible with Windows

[zhawenxuan]

Pycortex is not compatible with Windows, but other dependencies are Windows-compatible. What is the role of pycortex in the voxelwise_tutorials, and are there any alternative packages to pycortex that can be used on Windows?

[TomDLT]

Pycortex is actually only used to look at results in a 3D viewer, which is very much optional. Most of the tutorials can be run without it, so we might want to remove this dependency.

edit: actually it also uses pycortex's 2d colormaps, we would need to get them in another way.