raised "elevation" marks that are supposed to overlay other tiles to give the
appearance of a raised platform. The dlevel arches are the same graphics but
flipped in X and/or Y as appropriate to present a depression. Both arch sets
rely on the Crossfire perspective to give the hint of a ridge or depression.
In an elevation, the leading edges are long and the receding edges are short.
For the depression the leading edges are short and receding edges long.
git-svn-id: svn+ssh://svn.code.sf.net/p/crossfire/code/arch/trunk@8149 282e977c-c81d-0410-88c4-b93c2d0d6712
akirschbaum
kbulgrien