cubicweb-brainomics #3031799 imagen importer: missing handedness & gender [deprecated]

Information is in:
xnat:Subject/xnat:demographics/xnat:gender
xnat:Subject/xnat:demographics/xnat:handedness

prioritynormal
typebug
done in<not specified>
load0.000
load left0.000
closed by<not specified>
patch[importers] get rid of Subject age, fix gender and handedness [applied]