Don't leak the file handle after parsing the configuration
Don't leak memory if the file could not be opened
Check list name and filename attribute of configuration entry.
Add "blacklist help" and error messages to api interface.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>
Can be used to maintain lists of numbers and query/modify them with api commands.
Example:
blacklist add <list> <number>
blacklist del <list> <number>
blacklist check <list> <number> (outputs true or false)
