Added new '-c' (check) flag to cbd.
Added new '-c' (check) flag to cbd.

This flag can be used to test configuration file syntax. Some
verbose output is printed during file parsing. This fixes #3971.

git-svn-id: a49aa41e49c69a6ab6ef43f172843a2fef6cb475@1433 7c7d615a-03b3-410d-a316-1135b1bd9499

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