FoLiA v1.3

Added a 'comment' element (higher-order annotation) (issue #10)
Added a label attribute on set definition (issue #11)
Added a predicate span annotation element that groups semantic roles (issue #13)
Added a new linguistic annotation type for various observations on a text (issue #15)
Added a new linguistic annotation type for sentiment analysis (issue #16), this is now favoured over the older and more limited subjectivity token annotation element.
Added a new linguistic annotation type for attribution (issue #17)

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