By default, avoid creating a PIDFile.
PIDFiles are racy and potentially dangerous. Modern system
supervision systems don't need them, because they manage the process
groups directly.
If the configuration file doesn't specify a PidFile, dkimpy-milter
shouldn't try to create one.
- Implemented support for SyslogFacility option
- Initial dataset support: csl
- Only sign if mail from from a domain in Domain and only if Mode is not
verfication only
- Fixed Canonicalize option