- use ecm_qt_declare_logging_category and then bump the ECM version
  (which was already linked to the version of the other Frameworks
  components, so it's more a formal change than a real version bump).
  Change the category to be more in line with the last (unwritten,
  from the ground) conventions; as lskat was never released it's not
  really a problem.
- port the remaining kDebug() calls to qCDebug().