Two important fixes and some improvements.
- adapt to new shared-mime-info (so that .m2t is assigned to kaffeine again)
- workaround issue that video isn't shown without changing tabs when using QT 4.7
- recording schedule: fix sorting, improve column and dialog sizes,
show a warning about active and pending recordings when closing kaffeine
- program guide: remove the "Refresh" button (not necessary anymore)
- channel editor: allow sorting by drag and drop