Run Xfoil calculation. This method dispatches a child process, and feeds a sequence of commands to its stdin. After the calculation finishes, it outputs the contents of the resulting polar file in a HashMap. This method panics if something goes wrong either executing the child process, or retrieving a handle to its stdin. It may return an XfoilError if anything goes wrong writing to the process or parsing its output.
The type returned in the event of a conversion error.