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https://sourceforge.net/p/testlilyissues/issues/5340/
The old algorithm filtered the system's list of columns into a list of used columns, then searched the filtered list for the endpoints of the range to return.
The search key was the "rank" of a column, which is its index in the unfiltered list of columns (see System::add_column). There is therefore no need to search.
The new algorithm selects the desired range in the unfiltered list and then filters that.
This commit also removes the unused function Paper_column::compare.
I am assuming that this area of the code is well covered by the regression tests. I have not put any effort into verifying coverage.
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