The use of private properties complicates the interaction with Rotare.
So we simply get rid of it now and put all properties public.

This is probably something that we will do anyway in a later stage in
order to simplify development.

Signed-off-by: Thomas Lambert <t.lambert@uliege.be>

Signed-off-by: Thomas Lambert <t.lambert@uliege.be>

Signed-off-by: Thomas Lambert <t.lambert@uliege.be>

Signed-off-by: Thomas Lambert <t.lambert@uliege.be>

This adds a check to raise an error when the file is completely read and
it has not be determined to be a xfoil or xflr5 result file. This
prevent an infinite loop while trying to determine the result type.

- Use the proper syntax to take advantage of Matlab formatting and links
in help.

- Add more details and reformulate some stuff.

- Use the proper syntax to take advantage of Matlab formatting and links
  in help.
- Add more details and reformulate some stuff.

This tries to uniform the naming convention to US notation.

This ensures the tests are still passing with the new definition of
Polars (i.e. change from structure to object).

It also removes many duplicate tests (error tests based on inputs).
These tests are now only done on the parser functions and not the main
caller function. This simplifies test updates and reduces testing time.

Use Polar object instead of using a loosly defined Polar structure.
This adds robustness to these functions and will simplify future
developments.

BREAKING CHANGE: xf2mat no longer generates structures.
BREAKING CHANGE: any function that could took a polar structre as
input must now take a polar Object instead.

Keep Readme short and readble. The doc should be fully contained in the
MATLAB code of each function/class.

This commit also adds details on how to use classes and the description
of the Polar class.