Why dataFrame core depends on DataSource

[Ducasse]

This a strange idea to have the core depending on morphic!

[olekscode]

That's because in the older version of Pharo inspector we had to override showWithGlamourIn: to define the inspector view. And to make a table that can be displayed with Glamour, I had to use FastTable and some Morphic magic... I think that's the reason

Now that method should be removed and replaced with a nice Spec view. So it's related to this: https://github.com/PolyMathOrg/DataFrame/issues/147