Scaladoc display on completion & showToolTip

integrated with completion and 'Show tooltip'/F2 (which is not exactly hovers)
pinging @sschaef  because he should see the ugly handover from `getHoverInfo2` to `getHoverInfo`
<< I'm open for ideas on how to improve it which do not imply rewriting the `HtmlProducer` in `Scaladoc`
Not a big deal, but in general, I prefer to have ever-so-slightly different test strings. So I am sure that the returned value is exactly the one I want, not some other one due to some weird bug (timing, global value, ...). And to avoid some possible copy-paste errors, like if you had forgotten to replace `clasz.scala` by `packaged.scala` in the next line.