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Upgrade ADbC's intelligence regarding navigation and content generation

ADbC is now capable of dynamically loading modules in the modules/ directory
such that declaring the modules in config/main.php is no longer necessary.
All that is needed is to place human readable content in config/topics.php

ADbC also now offers navigation relative to the current topic (Previous/Next topic),
and a Gii module generator template geared specifically to CMODs.

As a last bonus, the kill() debug function now sets Content-type: text/plain
for preformatted output.