Use 70 degree angle for ridge-transform separation. #260
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Segments of mid-ocean ridges that deviate more than 70 degrees from the stage pole are transform segments.
This used to be an even 45 degree split, but we need to gravitate towards favouring ridge segments (by increasing the angle).
This is because, according to Dietmar, there are self-inconsistencies in the plate model (between the way plate boundaries are drawn and labelled and their correspondence to associated plate velocities) that are more apparent in deep time (eg, before 200 Ma) where there are mid-ocean ridges in large oceans NOT surrounding by passive margins.
closes #259