[FEATURE] auto-rename columns

[andrisi]

Parsing or Formatting?

• Formatting
• Parsing

Describe the solution you'd like
When a file has multiple columns with the same name, you could rename them automatically, perhaps adding a number, so for example with 3 "name" columns, we'd have "name 1", "name 2", "name 3" in the output.

Describe alternatives you've considered
Of course I can do it by reading the first line with the headers and adding a headers[g array with the new names.