More flexible attribute output for GFF dumping

Closed Marek Szuba requested to merge github/fork/james-monkeyshines/master into master

Created by: james-monkeyshines

Allow 'special' attributes (e.g. Dbxref, Ontology_term) to be specified as a list and written as a single comma-separated value. (This was already possible for generic attributes with uncapitalized first letters.)

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