Initial implementation of display of R2L paragraphs in GUI sessions.
xdisp.c [HAVE_WINDOW_SYSTEM]: Add prototype for append_stretch_glyph. (set_cursor_from_row) <cursor_x>: Remove unused variable. Fix off-by-one error in computing x at end of text in the row. (extend_face_to_end_of_line): If the row is reversed, prepend a stretch glyph whose width is such that the rightmost glyph will be drawn at the right margin of the window. (append_stretch_glyph): In reversed row, prepend the glyph rather than append it. Set resolved_level and bidi_type of the glyph.
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