Enhancement/Single class classification #489
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Doccano's text classification project type currently supports multi-class classification scenarios, i.e. each document can be annotated with N of M labels. However, sometimes we require single-class classification, i.e. each document can only be annotated with 1 of M labels.
This pull request adds an option to mark a project as "single class classification" which enforces that only a single label can be added to each document.