new branch
All Exceptions package.util
database exception
Merge branch 'Polimorphic_Airship_and_Exceptions'

Conflicts:
	bin/tests/AirCorridorInTimeTest.class
	bin/tests/ReadAirplanesCoordinatesTest.class
	bin/tests/ReportEmitterTest.class
	bin/utils/AirCorridorInTime.class
	bin/utils/Airship.class
	bin/utils/AltitudeComparator.class
	bin/utils/CargoAircraft.class
	bin/utils/CivilAirplane.class
	bin/utils/Database.class
	bin/utils/ReadAirplanesCoordinates.class
	bin/utils/ReadListOfFlights.class
	bin/utils/ReportEmitter.class
	src/utils/AltitudeComparator.java
	src/utils/CargoAircraft.java
	src/utils/CivilAirplane.java
	src/utils/ReadAirplanesCoordinates.java
	src/utils/ReadListOfFlights.java
	src/utils/ReportEmitter.java