Merge pull request #737 from revarbat/revarbat_dev

Removed invalid zip() reference.

comparisons.scad

@@ -779,7 +779,6 @@ function group_sort(list, idx) =
 // Usage:
 //   groupings = group_data(groups, values);
 // Topics: Array Handling
-// See Also: zip()
 // Description:
 //   Given a list of integer group numbers, and an equal-length list of values,
 //   returns a list of groups with the values sorted into the corresponding groups.