Document changes to windows code.
* frames.texi (Frames and Windows): Move section and rename to Windows and Frames in windows.texi. * windows.texi (Windows): Restructure. (Basic Windows): Rewrite. Explain live and internal windows and normalization functions. (Windows and Frames): Move section here from frames.texi. Describe subwindows, window combinations, window tree, and corresponding functions including window-list here. (Window Sizes): Rename section from Size of Window and move it up in chapter. Describe total and body sizes and the corresponding functions. Explain new semantics of window-min-height/-width. (Resizing Windows): Move section up in chapter. Describe new resize functions. (Splitting Windows): Describe new behavior of split-window, split-window-above-each-other and split-window-side-by-side. Provide examples. Describe window-nest and window-splits options. (Deleting Windows): Minor rewrite. (Selecting Windows): Minor rewrite. Describe frame-selected-window and set-frame-selected-window here. (Cyclic Window Ordering): Minor rewrite. Describe window-list-1. (Buffers and Windows): Rewrite. Explain a window's previous and next buffers and the corresponding functions. * elisp.texi (Top): Update node listings for frames and windows sections.
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