Version 0.3

The major changes are (since 0.3pre1):

• Performance data for the Bombardier Dash-8 Q400 and the Boeing 767-200ER and -300ER.
• The newer AIRAC files are handled properly.
• Flight levels are prefixed F instead of FL when exporting into the Squawkbox flight plan format.
• Performance data for Airbus A321.