Added missing "#include sh_point_find.h" from sharpinfo.cxx.
Cleaned up code.
Replaced GRADIENT_TYPE with GRADIENT_COORD_TYPE.
Delete obsolete GRADIENT_TYPE.
Replaced obsolete ISODUAL_GRID with SHARPISO_GRID.
Replaced obsolete ISODUAL_SCALAR_GRID_BASE with SHARPISO_SCALAR_GRID_BASE.
Replaced obsolete ISODUAL_SCALAR_GRID with SHARPISO_SCALAR_GRID.
Made compute_edge_intersection in sharpiso_intersect.h.
a member of namespace SHARPISO.
Deleted compute_edge_intersection from sharpiso_get_gradients.cxx.