- LeoLog is no longer a subclass of the HighLevelInterface class.
  This required a hack to handle keystrokes in the log pane:
  k.masterKeyHandler sends strokes to c.frame.log.logWidget (a QTextEditWrapper)
  by changing event. widget.
  QTextMixin sets supportsHighLevelInterface = True as a signal to k.handleDefaultChar.

Leo build: 20140903172649