Modify costs to correspond to changes in simutrans-experimental at git commit #7f9b836.  The costs are the same, but different ones are adjusted for meters_per_tile than before.  This is an attempt to make the game slightly more robust to meters_per_tile changes.  Also fix spelling errors.
Drop comfort level of stagecoach, to encourage "staging" (yeah, like in real life)
Improve comment in simuconf.tab
Merge branch 'ncn-devel' of http://github.com/neroden/simutrans-pak128.britain.git

Conflicts:
	bus/stagecoach.dat