expose a dbus server to control hslogger

 dbus-hslogger exports:
 setLogLevel, setLogLevelMethodCall, maybeToEither,
 setLogLevelFromPriorityString, setLogLevel, logInterface,
 logPath, startLogServer, and logIntrospectionInterface.
 .
 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.