csvtk join does not allow duplicated column names

[MostafaYA]

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• [ ] provide a reproducible example

Hi, csvtk join does not allow duplicated column names as of version 0.26.0. This was ok in the previous version.

Input table below gives the error: [ERRO] duplicate colnames not allowed: Allele	Sample	Scheme	ST	Allele	Allele	Allele	Allele	Allele	Allele	Allele
sample	cdifficile	8	adk(1)	atpA(1)	dxr(2)	glyA(6)	recA(1)	sodA(5)	tpi(1)

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[shenwei356]

Sorry for this bug. I've changed the logic: only selected columns cannot be duplicated now.

• csvtk_darwin_arm64.tar.gz
• csvtk_linux_amd64.tar.gz
• csvtk_darwin_amd64.tar.gz