* Added 'RnRmlOwner=' and 'RnRmlGroup=' directives to rd.conf(5).
* Refactored the implementation of the 'Run Shell Command' ['RN']
RML to use runuser(1).
* Changed the PyPAD namespace from 'PyPAD' to 'pypad'.
* Changed the installation location of PyPAD scripts from
'@libdir@/rivendell/PyPAD/' to '@libdir@/rivendell/pypad/'.
* Renamed the RD_RLM2_CLIENT_TCP_PORT define to RD_PAD_CLIENT_TCP_PORT.
* Renamed the RD_RLM_SOURCE_UNIX_ADDRESS define to
RD_PAD_SOURCE_UNIX_ADDRESS.
* Added a RD_PYPAD_SCRIPT_DIR define.
* Added an 'RDNotification::PypadType' value to the
'RDNotification::Type' enumeration.
* Added 'PypadOwner=' and 'PypadGroup=' directives to the
'[Identity]' section of rd.conf(5).
* Added an rdpadengined(8) service.
* Added a 'PYPAD_INSTANCES.IS_RUNNING' field to the database.
* Added a 'PYPAD_INSTANCES.EXIT_CODE' field to the database.
* Added a 'PYPAD_INSTANCES.ERROR_TEXT' field to the database.
* Incremented the database version to 304.
