changed the default srtm mirror, because our own is currently broken
changed the default srtm mirror, because our own is currently broken

MISS3D/s2p,carlodef/s2p,jmichel-otb/s2p,dyoussef/s2p,jmichel-otb/s2p,MISS3D/s2p,carlodef/s2p,dyoussef/s2p,mnhrdt/s2p,dyoussef/s2p,jmichel-otb/s2p,MISS3D/s2p,MISS3D/s2p,jmichel-otb/s2p,dyoussef/s2p,mnhrdt/s2p