Speed Calculator

[BrianG]

Ok, another update:

- Fixed differential manufacturer typo.

- In the Top Speed Estimator, removed the suggested "1:1 rollout" pinion in the results section. This was changed to show the current rollout ratio. The pinion tooth count to achieve a 1:1 rollout is still listed in the pinion table (click the gears icon in the results section). Added more verbiage to explain rollout and the "1:1 Rollout" rule (in the help function). Also changed the error message to be more appealing.

- Changed the color of the help window from drab gray to something that stands out a little more.