cubicweb-brainomics #3028907 age should not be an attribute of Subject [resolved]

See ticket #2818501 for cubicweb-medicalexp.

done in0.5.0
load left0.000
closed by<not specified>
patch[importers] age from Psytools experiment ends up in Assessment [applied][importers] get rid of Subject age, fix gender and handedness [applied][views] display age range for assessments related to a Subject [applied][importers] age was inserted twice [applied][facets] age of Subject is obsolete [applied]Age is wrongly associated to subject in input files [applied]