Some minor bugs

[sunake]

Appreciate getting the 1.0.3 update out to us, it's working great! I would just like to report a couple minor bugs

1. When set to LBS, the landing weight on the APP page has a T next to it instead of LBS

2. The apu fuel used still shows quantity in KG on the APU page. 

3. If there is NONE as alternate in simbrief, when importing flight plan, the MCDU give an airport not in database Message.