atmosphere_f16 validation

[AlexS12]

Implementation of atmosphere_f16 produces results different from atmosphere_isa (see test\atmosphere.jl. Apparantly the model is the same and only units change. However, tests used for validation of F16 model relying on data from

Stevens, B. L., Lewis, F. L., & Johnson, E. N. (2015). Aircraft control
and simulation: dynamics, controls design, and autonomous systems. John Wiley
& Sons.

do not pass if ISA1978 is used.

Some investigations must be performed in order to determine the reason of the differences found.

Possible candidates:

• Unit conversion factors
• Model coefficients