General fields layout: url and doi missing

[Siedlerchr]

Default layout does not contain the fields url;doi;arxiv; and so on:

[tobiasdiez]

Applies only to bibtex I think

[Siedlerchr]

This should be a preferences issue only as it can be configured via Options -> Setup General fields

[stefan-kolb]

This has really high priority as we do every fetching based on the DOI fields!

[stefan-kolb]

Applies only to bibtex I think

Applies to both modes as far as I can see.