(forward_point): Function deleted.

(forward_point): Function deleted.
(Fforward_point): Just add.
(Fforward_char): Don't call forward_point, just add.
(Fforward_line): Use scan_newline.
(Fdelete_char): No need for forward_point, just add.
(Fdelete_backward_char): Handle bytes and chars.
(internal_self_insert): Handle bytes and chars.