cubicweb-frbr #3850955 Birthdate and deathdate [validation pending]

The correct vocabulary for birthdate and deathdate is currently (22/05/2014) bio: Birth and bio:Death.

prioritynormal
typebug
done in0.1.1
load0.100
load left0.000
closed by#47d996ee0fec [xy] Change birth and death dates vocabulary, closes #3850955