More explicit message: Metacore object

[cpiraux]

I am not an R expert and I found difficult to access the structure and values of metacore object.
If we look in the tab environment, there is no description of the object, and it is not possible to click on it

If we run metacore in the console, we receive a message with the number of datasets.

I would be nice to have the structure of metacore object when we run metacore in the console (see below) or indicate to run View(metacore) to have more details