Configuration parameter naming is not systematic

[mbartosch]

Lately CertNanny configuration directives have been lacking systematic usage of configuration keys.
Former versions used all lower-case keywords in configuration keys. Current version uses a non-systematic mix of lower case and CamelCase.

Suggestion: clean up, use lower case in configuration templates.
To retain backwards compatibility consider making configuration keys case-insensitive (otherwise case changes will make existing users go mad).