Some pre-proc and input files for the Global SCHISM project

(1) DEM tiles: /sciclone/home20/whuang07/schism20/Global/RUNdir/DEM/dem_*.asc 
     order in: /sciclone/home20/whuang07/schism20/Global/RUNdir/DEM/symlink_dems.pl
     tiles include: "gebco_","RTopo-2.0.1","nonna100_ll_merged"
     Min h: 5m for all, 50m for TW
(2) Interp script is interpolate_depth_structured2_mpi.f90