Put qtconsole forground when launching

[Carreau]

That's a one line change, but it is nice to have the qtconsole on top and in focus when you invoke it.

[fperez]

The window is already always raised for me on ubuntu. On what platforms is this actually necessary?

We're reaching RC freeze pretty quickly, so at this point even small changes should be considered very carefully and unless truly necessary and safe, they should wait for 0.13.

[Carreau]

For me, on mac (work and home), it is always the lower window when launching, and last in the alt+tab switcher.
I'm ok with waiting for 0.13, and it's all but necessary it just an UI detail.

[fperez]

@minrk, you're on OSX too, can you confirm that you have this problem as well? The change is small so I'm OK putting it in before 0.12RC, but only if we confirm it affects all OSX users and that the fix indeed does the job.

[minrk]

Indeed, the Terminal does maintain focus when launching a qtconsole, and this commit changes that. The change seems sensible to me.

[fperez]

Fair enough, let's put it in then. I'll rebase now to avoid the merge handle and will push.

[fperez]

Never mind, it was already a ff merge so no rebase needed. Pushed. Thanks to both of you!