Allow for noHeader option

[HoffmannP]

Rollup Plugin Name: `dsv

`

This PR contains:

• [ ] bugfix
• [x] feature
• [ ] refactor
• [x] documentation
• [ ] other

Are tests included?

• [ ] yes (bugfixes and features will not be merged without tests)
• [x] no (will write if feature would be accepted)

Breaking Changes?

• [ ] yes (breaking changes will not be merged unless absolutely necessary)
• [x] no

List any relevant issue numbers:

Description

This feature allows to configure including csv/tsv files without the first row being used as the header line

[shellscape]

Will be closing as abandoned if requests aren't addressed after a month.