Rework flight numbers and anonymous aircraft (Android and iOS)

[ericberman]

Several issues here:

• put flight number after date, before route
• The tail number and the model are redundant if no Aircraft Registration is provided. E.g., an anonymous C-172 will display as "(C-172) (c-172); coalesce those by suppressing one or the other (probably the tail?)
• Same issue in the aircraft list
• Open question: if the "Aircraft Registration" field is present, should we show that as the tail? Or perhaps, show it in the model display (e.g., "(C-172)- N12345")? Or just drop it down to the rest of the properties?