MICS sibling history variable map for MICS7
sibhist_varmap_mics7.RdIdentical to sibhist_varmap_mics6; the MICS7 maternal mortality module is unchanged from MICS6.
sibhist_varmap_mics7.RdIdentical to sibhist_varmap_mics6; the MICS7 maternal mortality module is unchanged from MICS6.