There was an inconsistency between the use of "slope walls" and "new foundation" for retaining walls.  Use "slope walls" consistently as they are prettier.
Remove "spacilive" from first line, as it may confuse the parser.
Add comments to sound.tab
Bring over climate sound effects and propeller plane (planelow) sound effect from pak64 (should have correct licensing).  (Other pak64 sound effects are Wrong For Britain.)
Merge branch 'ncn-devel' of http://github.com/neroden/simutrans-pak128.britain.git
ADD: SR 4DD (Junna)
ADD: BR blue livery for the BR 2/4EPB
CODE: Remove livery designations from the names of the 4-COR and 2-BIL
ADD: BR blue livery for the 4-COR (Junna)
ADD: BR blue livery for the 2-BIL (Junna)