Test demonstrating SI-8085

* The presentation compiler sourcepath is now correctly set-up.
* Amazingly enough (for me at least), the outer import in the
  package object seem to be responsible of the faulty behavior.
  In fact, if you move the import clause *inside* the package object,
  the test succeed!
  The test's output does provide the correct hint of this:

```
% diff /Users/mirco/Projects/ide/scala/test/files/presentation/t8085-presentation.log /Users/mirco/Projects/ide/scala/test/files/presentation/t8085.check
@@ -1,3 +1,2 @@
 reload: NodeScalaSuite.scala
-prefixes differ: <empty>.nodescala,nodescala
-value always is not a member of object scala.concurrent.Future
+Test OK
```

Notice the ``-prefixes differ: <empty>.nodescala,nodescala``. And compare
it with the output when the import clause is placed inside the package
object:

```
% diff /Users/mirco/Projects/ide/scala/test/files/presentation/t8085-presentation.log /Users/mirco/Projects/ide/scala/test/files/presentation/t8085.check
@@ -1,4 +1,2 @@
 reload: NodeScalaSuite.scala
-reload: NodeScalaSuite.scala
-open package module: package object nodescala
 Test OK
```

Notice now the ``-open package module: package object nodescala``!