Fix pyqode main docstring (uniformised with other pyqode namespace packages)
Make use of the new find_symbol_pos function
Add a hack to provide completion on the pyqode.qt package

this work only on the current file (widget imported from  other modules loose their qt completions...)
Simplify and improve the hack

Now we just preload pyqt4 API. This works even when QT_API is set to something else and now the full pyqode api is covered (e.g. CodeEdit.appendText shows up in the completion list).