feature/angular_velocity #2
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The pm_x and pm_y derivatives were accidentally in terms of days and not seconds. This commit changes the derivatives to be in terms of seconds.
Additionally, fix a couple of typos and a unit error in the t_ti derivative test.
Pchip interpolation ensures C1 continuity while avoiding global constraints such as in piecewise cubic spline interpolation. The Pchip routine added by this commit is now used by the BulletinData class. The added curvature did increase the error in some tests when compared to the basic finite difference calculation, so the test thresholds had to be increased.
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Add functions to the primary transformation class which compute
Earth's angular velocity tensor. The tensor is computed primarily by
taking the partial derivative of the IAU 2006/2000A equations with
respect to time (in seconds).