This module handles interaction with configuration files of the style used
by the version control system Git. It can both parse and modify these
files, as well as create entirely new ones.

You only need to know a few things about the configuration format in order
to use this module. First, a configuration file is made up of key/value
pairs. Every key must be contained in a section. Sections can have
subsections, but they don't have to. For the purposes of setting and
getting configuration variables, we join the section name, subsection name,
and variable name together with dots to get a key name that looks like
"section.subsection.variable". These are the strings that you'll be passing
in to 'key' arguments.

Configuration files inherit from each other. By default, 'Config::GitLike'
loads data from a system-wide configuration file, a per-user configuration
file, and a per-directory configuration file, but by subclassing and
overriding methods you can obtain any combination of configuration files.
By default, configuration files that don't exist are just skipped.