Dual mode places even pages to the left. Fix for the bug #309393.

Dual mode places even pages to the left. Fix for the bug #309393.

	* shell/ev-page-cache.c: (build_height_to_page),
	(ev_page_cache_get_height_to_page):
	* shell/ev-page-cache.h:
	* shell/ev-view.c: (view_update_range_and_current_page),
	(get_page_y_offset), (get_page_extents), (ev_view_next_page),
	(ev_view_previous_page):

	Dual mode places even pages to the left. Fix for the bug #309393.

	* shell/ev-view.h:
	* shell/ev-window.c: (update_action_sensitivity),
	(setup_view_from_metadata), (view_menu_popup_cb):

	Don't restore presentation in empty windows, more intelligent
	next page behaviour in dual mode.

	* shell/ev-pixbuf-cache.c: (check_job_size_and_unref),
	(ev_pixbuf_cache_clear_job_sizes):

	Cleanup job callback on removal. Fix for the bug #325886.