Grammar-based, user-friendly config parser

Config::Grammar is a module to parse configuration files. The
configuration may consist of multiple-level sections with assignments
and tabular data. The parsed data will be returned as a hash
containing the whole configuration. Config::Grammar uses a grammar
that is supplied upon creation of a Config::Grammar object to parse
the configuration file and return helpful error messages in case of
syntax errors. Using the makepod method you can generate documentation
of the configuration file format.