[AD] Small patch to keep documentation lines small for .txt files

[Grzegorz Adam Hankiewicz <gradha@xxxxxxxxxx>]

Hi.

The following patch is implemented as an optional switch, meaning that
whoever writes documentation should use it manually to see if the
documentation lines exceed the usual 77 length, which IIRC has always been
the length aimed for .txt readers. Or it can be used from time to time or
before important releases.

And the second patch is a correction of the documentation to avoid
overflowing the 77 line length, plus two scene_render fixes which got
overlooked during the Z-buffer API change.

--
 Grzegorz Adam Hankiewicz   gradha@xxxxxxxxxx   http://gradha.infierno.org

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