Re-enable acronym-style completion, e.g. getClass.gdm`
offers `getDeclaredMethod[s]`.

Under JLine completion, move all filtering up in the UI layer.
Reimplement scala#9510 (dealing with overloads that contain some
deprecated alternatives) in the UI layer

Fix completion of keyword-starting-idents (e.g. `this.for<TAB>` offers
`formatted`.

Register a widget on CTRL-SHIFT-T that prints the type of the
expression at the cursor. A second invokation prints the
desugared AST.

Enable levenstien based typo matching, but disable it for short strings
which IMO tends to offer confusing results.

Enable levenstien based typo matching:

```
scala> scala.tools.nsc.util.EditDistance.levenshtien<TAB>

scala> scala.tools.nsc.util.EditDistance.levenshtein
```