updated Stellarium QRC

For the impending Stellarium workshop, I thought I'd review the Quick Reference Card that I made. It worked well for the spring workshop. But now version 0.11.x is out. Would it need to be modified? It also occurred to me that I had written it for the Windows and Macintosh platforms specifically but that I might want to adjust it to support the UNIX environment. So I fired up Ubuntu Linux and Stellarium 0.10.5 and checked on the keyboard shortcuts. Was pleased to see that everything was good. That is, there were no mistakes or errors in the QRC per se. But also that the keyboard shortcuts for Linux are identical to Windows. So it required only very minor edits.