This allows the user to create polars for interpolated airfoils.
When the shape of the local airfoil is unknown but is between sections
of known airfoils, this allows to create interpolated airfoils polars
based on the known polars of the bounding airfoils.

Rather than looking for the stall point using findpeaks, simply look for
the highest local maximum. Not only is this faster and cleaner, but it
removes the unneeded dependency to the _Signal Processing Toolbox_.

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>

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.

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.

The previous way of doing stuff was not allowing to load files from
multiple (sub)directories. This commits allows the user to specify
files from various directories as a string array.

BREAKING: This commit changes the input arguments for **xf2mat** and
**formatairfoilcoord**.