75 two columns of the same name in parametric test values

[xidongdxi]

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Changes Description

Closes #75

When running a graphical MCP, the detailed test values data frame has two columns named *. This PR de-duplicates those names by removing them. Commits from #76 have been incorporated.

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[EeethB]

I really like this! Having non-standard column names is a little clunky. I think if we're pulling the * columns, maybe we should pull the <= column too? I added a commit that does a couple things:

1. Removes the <= column
2. Adds the operator columns back in during printing. It was not too complicated to do, and I think it adds clarity.

@xidongdxi let me know what you think of both changes, and we can go from their. Either one would be easy enough to revert if you don't prefer it.

[EeethB]

Thanks for catching this!

[xidongdxi]

Thank you very much @EeethB! This change looks great. Let's proceed to merge the PR. Please approve the PR when you are ready. Many thanks.