Fix image file names.
Merge pull request #24 from btdn/dc3

Fix image file names for DC3
Merge branch 'master' of git@github.com:jamespetts/simutrans-pak128.britain.git into half-heights
ADD: noise barrier way object to allow roads in cities to maintain their
full speed limit
ADD: precompiled PAK file for the noise barrier
Merge branch 'noise-barrier' of https://github.com/pipcet/simutrans-pak128.britain.git into half-heights
FIX: Add missing translation text for the noise barrier