More 16bit fixes. * src/autohint/ahglobal.c (sort_values): Use FT_Pos for `swap'. (ah_hinter_compute_widths): Use FT_Pos for `dist'. Use AH_MAX_WIDTHS. * src/autohint/ahglyph.c (ah_outline_scale_blue_edges): Use FT_Pos for `delta'. (ah_outline_compute_edges): Replace some ints with FT_Int and FT_Pos. (ah_test_extrema): Clean up code. (ah_get_orientation): Use 4 FT_Int variables instead of FT_BBox to hold indices. * src/autohint/ahtypes.h (AH_SegmentRec): Change type of `score' to FT_Pos.