A1: Simplified FindNeighbours with Linq
A2: Using Linq in ReadCities
A3: Implemented FindCities by TransportMode
Added Lab06: UnitTest
Fixed spelling error
Merge branch 'local'

Conflicts:
	RoutePlannerLib/Cities.cs
	RoutePlannerTest/Lab06Test.cs
Removed wrongly placed }
Removed additional FindCities method