small changes to the tooltip stuff.
Merge branch 'master' of github.com:mbeddr/mbeddr.core
Tooltips: improved the range of the radar by upgrading to a phased array antenna
Tooltips are now shown with a delay of 750 ms. If another tooltip was visible in the last 1000 ms or the CTRL key is pressed, tooltips are shown immediately.
Tooltips: non-linear radar (opacity = exp(-distance/400) )
Tooltips: The radar marks were not cleaned up correctly. Screensaver installed to prevent burn in of the marks into the radar control screen.
Merge remote-tracking branch 'upstream/master'