Setup a local configuration file in Codeigniter

After four years of development, I’m still a big CodeIgniter fan, although some other frameworks are starting to look mighty interesting.  Despite the bugs in Version 2.0.2, however, CI is heading in the right direction.

One CI-related issue that has caused problems for my workplace in the past has been the ability to setup distributed development environments.  Everybody has a different local setup, and some of the configuration directives inside of CI’s application/config folder must change from machine to machine.

Of course, we can’t just tell Mercurial to ignore that folder during commits, because there are some configuration directives that should remain the same across all environments, such as language, charset, enable_hooks, etc.

So, how to make some configuration settings consistent across different computers, and how to make some local settings?
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