Rename columns

1. Use the Table.RenameColumns() to apply intuitive names for users and to benefit the Q & A engine for natural language queries.

1. Use renaming to remove any source system indicators, add a space between words for non-key columns, and apply dimension-specific names such as Customer Gender rather than Gender.
2. Key columns will be hidden from the Report View.
3. Table.RenameColumns() also offers the MissingField.UseNull option.