Jan 7, 2017

v6.1, 2017 January 7th:
Fix P->R routine in some cases.

v6.0, 2016 December 30th:
First version of Marine Navigation Library.
First version of Aviation Library.
Fix some issues found while implementing the new libraries.
Add graphics in some help messages.

v5.9, 2016 December 17th:
Fix printer output in obscure context
Fix some state when entering numbers

v5.8, 2016 November 23rd:
Add support for virtual card (2nd write)
Fix Inv P->R (result in proper quadrant)