* window.h (struct window): Convert left_margin_cols and

* window.h (struct window): Convert left_margin_cols and
right_margin_cols from Lisp_Objects to integers.  Adjust comment.
(WINDOW_LEFT_MARGIN_COLS, WINDOW_RIGHT_MARGIN_COLS)
(WINDOW_LEFT_MARGIN_WIDTH, WINDOW_RIGHT_MARGIN_WIDTH):
Adjust users.
* dispnew.c (margin_glyphs_to_reserve): Convert 3rd arg to int.
Adjust comment.
(showing_window_margins_p, update_window_line, update_frame_1):
* fringe.c (draw_fringe_bitmap_1):
* xdisp.c (window_box_width): Adjust users.
* window.c (wset_left_margin_cols, wset_right_margin_cols): Remove.
(adjust_window_margins, set_window_buffer, Fsplit_window_internal):
Use direct assignment.
(Fset_window_configuration, save_window_save, Fwindow_margins):
Convert Lisp_Object to integer and back where appropriate.
(Fset_window_margins): Adjust user.  Return t if any margin
was actually changed, and mention this in docstring.