anchor.diff:  6,user_8,Group uniquely assigned to user 8
   7,user_9,Group uniquely assigned to user 9
   8,user_10,Group uniquely assigned to user 10
  +9,user_11,Group uniquely assigned to user 11
   
   
   TABLE auth_membership
  
positive.code: 
  TABLE inasistencias
  inasistencias.inasistenciaid,inasistencias.descripcion
  6,Completa
  7,Tarde
  8,Retiro Anticipado
  9,Media falta
  
  
  TABLE periodos
  
negative.code: 11,9,7
  12,9,1
  13,10,3
  14,11,3
  
  
  TABLE auth_permission
  