Config documentation updates

[Amos Jeffries]

I have committed updates to the cf_gen tool which fix some of the 
annoyances I've had with the configuration file template syntax.

We can now pre-define multiple lines of default config and provide a 
textual alternative representation to hide the internal config 
definition from the distributed documentation.

Amos
--
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  Current Stable Squid 2.7.STABLE9 or 3.1.14
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