ADD: Handley Page W8b
CHANGE: Increase alternative destinations
CHANGE: Slightly increase journey time tolerances for commuters
CHANGE: Increase passenger and mail generation ratios
Merge branch 'Payload' of https://github.com/Milkogit/simutrans-pak128.britain.git into half-heights
CHANGE: Reduce the maximum number of boats on canals and rivers, which is now achievable without deadlock owing to recent improvements in the code. These lower figures are more realistic than the previous higher figures.