qInstallMessageHandler <-> qInstallMsgHandler

[tobiasgehring]

The installer for the message handler is called qInstallMsgHandler in PyQt4 and pyside and qInstallMessageHandler in PyQt5. In PyQt5 the message handler got an extra argument called context.

The reason to use qtpy is to have a program running in all three environments. Thus, there should be a unified way to use it (e.g. set context to None if pyqt4/pyside is used).

[goanpeca]

@tobiasgehring thanks for pointing this out, we will take a look at it.

[ccordoba12]

@tobiasgehring, could you create a pull request for this? I don't exactly understand what we're supposed to do about this one.

[goanpeca]

@rlaverde could you take a look at this one?