Add Tiling.mt test file
Regenerate WaveHost
CodeGenMakefile.m: Only add .cc files to make.code.defn

This allows header files to be included in the list of generated "sources"
KrancThorn.m: Add ThornName to calculation
Add Tile option to calculations
Add ability to loop over the grid in tiles

Tile size is specified by the tile_size parameter, Tile -> True should be passed to CreateThorn, and tiling applies only to calculations on the Interior.  The position within the tile can be found with the variables ti, tj and tk.