bahn.de: Support for direction in journey planner
UI: Display direction of train in journey details

Closes #119 - [Request] Show direction of S-Bahn, metro, tram, bus etc.
in journey details
Fix: No need to seek as `hafasData >> tmpTxtPtr` moves current position
bahn.de: Display comments as additional info in journey details
Some improvements to calendar entry text:

- display direction of the train;
- don't display additional info in compact format.
vasttrafik.se: Use new `direction` property in journey details
HAFAS XML: Support for direction and train info in journey details
Merge pull request #120 from leppa/master

bahn.de, sbb.ch, öbb.at, rejseplanen.dk: Support for direction and comments