`nipy.model.FitGLM` doesn't use nipy `GLM.GeneralLinearModel` properly

[djarecka]

Summary

FitGLM is not working, GLM.GeneralLinearModel is not used properly here.

I failed to find a version of nipy class that was compatible with it, but for at least 6 years __init__ requires X (https://github.com/nipy/nipy/blob/master/nipy/modalities/fmri/glm.py#L90) and fit method has also a different specification.

This class is used fmri_nipy_glm.py that returns error (#2624)

[effigies]

Removing the milestone, as I don't see much interest in getting this fixed. Once work starts, we can figure out a time frame.