Feature supersonic

Added supersonic aero functions and restructured the aero methods - see below:

Methods/
 Fidelity_Zero/
  ...functions
 Supersonic_Zero/
  ...functions

Functions are duplicated here but this was thought to be easier to use and develop than setting up flags for switching capabilities. It is also more in line with the multifidelity goals of SUave.

Tutorial files were added for use in AA241 and others new to the code