pyside 1.1.0 does not cope well with multiple inheritance

Due to the multiple inheritance in the log viewer, the app won't start under osx with python 2.6 and pyside 1.1.0 That's the only version of pyside I'm able to run, since 1.1.1 is compiled against qt 4.8 and needs 64 bits architecture.

A workaround is in place in the osx branch.

(from redmine: created on 2013-06-12, closed on 2013-06-13)