ENH: airfoil outputs (resolve #144)

[Gui-FernandesBR]

Pull request type

Please check the type of change your PR introduces:

• Code base additions (bugfix, features)

Pull request checklist

Please check if your PR fulfills the following requirements, depending on the type of PR:

• Code base additions (for bug fixes / features):

  • Tests for the changes have been added
  • Docs have been reviewed and added / updated if needed
  • Lint (black rocketpy) has passed locally and any fixes were made
  • All tests (pytest --runslow) have passed locally

What is the current behavior?

You give an airfoil curve as input, but RocketPy do not let you to check if the curve is correct.

What is the new behavior?

A few more plots or prints were added to improve the visualization of airfoil data when it is used.
This closes #144

Does this introduce a breaking change?

• No

Other information

Easy to review.

[phmbressan]

Good PR, solves an old issue.

[Gui-FernandesBR]

The previous naming is not that good, but its there just to differentiate clalpha2D_mach0 form clalpha2D

Please check the last version of the code (screenshot below).

I believe the clalpha2D_incompressible is a clearer name for such variable.
Also, I refactor the code bit so the beta correction is called just once.