Two 5-Digit Airfoil Classes

[ddmarshall]

There should be two separate classes for the 5-digit thicknesses:

• [ ] One that uses the standard coefficients and can only take parameters that are canonical parameters matching the 5-digit spec. This means that there will only be a small number of 5-digit camber lines allowed because of the limited number of published settings.
• [ ] One that solves for the camber terms, uses the enhanced 4-digit thickness coefficients and can take floating point values for all of the parameters associated with the 5-digit airfoil.

Note that these two will not produce the exact same airfoil when provided the same settings because of the errors in the standard coefficients.

[ddmarshall]

Commit f1fa3293 addresses this issue.