refactor Model to use correlation matrices directly about supereeg HOT 3 CLOSED

I'm not sure this is needed-- punting for now (removing from milestone)

If the "numerator and denominator" version works with the refactor, i think it's a stronger approach

from supereeg.

I've refactored init, but there seems to be a bug whereby the numerator and denominator are getting set to None unexpectedly. I think I could go about this by using different cases to initialize the model:

• specify model object directly
• specify numerator and denominator directly
• specify correlation matrix directly
• specify brain object
• specify nifti object
• specify two model objects with same properties and ensure they're combined correctly
• specify two model objects with different (overlapping) locations and ensure they're combined correctly
• specify two model objects with different (non overlapping) locations and ensure they're combined correctly
• specify a mixed list of the above and ensure everything is combined correctly

from supereeg.

dealt with in supereeg 0.2.0

from supereeg.