working chunked-streaming of remote-rendered mandelbrots in web_main, next step will be flow control. Remote rendering doesn't compile in render_node.

committer: Tero Marttila <terom@fixme.fi>

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void die (const char *msg);

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void error (const char *fmt, ...);

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void perr (const char *fmt, ...);

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void perr_exit (const char *fmt, ...);

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void err_exit (const char *fmt, ...);

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