Replacement logic not implemented for param tables

[SimonHeybrock]

#90 implemented replacing of params and providers (including with each other). However, this logic does not include param tables (and their columns). We still have check in place that prevent some (but not all) clashes (instead of replacing). Furthermore, we currently allow for indices and column labels that are duplicates of regular params or providers.

This needs to be thought through thoroughly, since there are some subtleties such as multi-level grouping operations where the index type of one table also is a column label of another table.