Removed sloppy shells on water, lvl 2 expanded

Addition terrain was generated for level 2 expansion. there should be
more then enough room to place new stuff. It will need to be cleaned
after level 2 foundation is placed.
when I placed shells,  i noticed some got placed on top of the waterbox.
those shells have been removed. there's a reasonable chance some got
missed, and shells on top of water still exist.