* Implement Natural_Order and sort_columns
* Starting on Rename
Align Column_Mapping
Add By_Position
Separating off the validation for By_Index so can reuse for rename
By_Position implemented
By_Index implemented
Adjusted behaviour following discussion with Ned, so that renames dominate untouched columns.
Moving to validation style checks for problems
Putting accumulator back
Rename work
* Add Range.find
* More work
* Regex support
Tidy of Unique Name Strategy
* Fix Regex support
* Warning messages
Tests for Unique Naming Strategy
Table rename working
* Database Table rename_columns
Fix for Table
**Must follow up on slice**
* Some tests
* More tests
* Complete test set
(and associated fixes)
* Functional use_first_row_as_names
Tests to go...
* Test for use_first_row_as_names
* Change log
* trailing space
Co-authored-by: Radosław Waśko <radoslaw.wasko@enso.org>
