anchor.diff:  
   TABLE faltas
   faltas.faltaid,faltas.alumnoid,faltas.comisionid,faltas.inasistenciaid,faltas.fecha,faltas.cantidad,faltas.justificado,faltas.detalle
  -1,22,25,7,2013-08-27,1.0,True,Falta medica
  -2,10,26,6,2013-08-23,1.0,False,tarde
  -3,22,27,7,2013-08-15,1.0,False,
  -6,10,30,7,2013-08-28,1.0,False,
  -7,21,26,7,2013-09-06,1.0,False,
  -8,10,30,1,2013-09-12,1.0,False,<NULL>
  -9,21,28,1,2013-09-12,1.0,False,<NULL>
  -10,10,28,1,2013-09-12,1.0,False,<NULL>
  -11,21,28,1,2013-09-12,1.0,False,<NULL>
  -12,10,28,1,2013-09-12,1.0,False,<NULL>
  -13,21,28,1,2013-09-12,1.0,False,<NULL>
  -14,10,28,1,2013-09-12,1.0,False,<NULL>
  -15,21,28,1,2013-09-12,1.0,False,<NULL>
  -16,10,28,1,2013-09-12,1.0,False,<NULL>
  -17,21,28,1,2013-09-12,1.0,False,<NULL>
  -18,10,28,1,2013-09-12,1.0,False,<NULL>
  -19,21,28,1,2013-09-12,1.0,False,<NULL>
  -20,10,28,1,2013-09-12,1.0,False,<NULL>
  -21,21,28,1,2013-09-12,1.0,False,<NULL>
  -22,10,28,1,2013-09-12,1.0,False,<NULL>
  -23,21,28,1,2013-09-12,1.0,False,<NULL>
  -24,10,28,1,2013-09-12,1.0,False,<NULL>
  -25,10,30,1,2013-09-13,1.0,False,<NULL>
  -26,10,30,1,2013-09-13,1.0,False,<NULL>
  -27,10,30,1,2013-09-13,1.0,False,<NULL>
  -28,10,30,6,2013-09-13,1.0,False,<NULL>
  -29,10,30,6,2013-09-13,1.0,False,<NULL>
  -30,10,30,6,2013-09-13,1.0,False,<NULL>
  -31,10,30,8,2013-09-17,1.0,False,<NULL>
  +1,22,25,7,2013-08-27,0.25,True,Falta medica
  +2,10,26,6,2013-08-23,0.5,False,tarde
  +3,22,27,7,2013-08-15,0.25,False,
  +6,10,30,7,2013-08-28,0.25,False,
  +7,21,26,7,2013-09-06,0.25,False,
  +8,10,30,7,2013-09-12,0.25,False,lal
  +9,21,28,7,2013-09-12,0.25,False,
  +10,10,28,7,2013-09-12,0.25,False,
  +11,21,28,7,2013-09-12,0.25,False,
  +12,10,28,7,2013-09-12,0.25,False,
  +13,21,28,7,2013-09-12,0.25,False,
  +14,10,28,7,2013-09-12,0.25,False,
  +15,21,28,7,2013-09-12,0.25,False,
  +16,10,28,7,2013-09-12,0.25,False,
  +17,21,28,7,2013-09-12,0.25,False,
  +18,10,28,7,2013-09-12,0.25,False,
  +19,21,28,7,2013-09-12,0.25,False,
  +20,10,28,7,2013-09-12,0.25,False,
  +21,21,28,7,2013-09-12,0.25,False,
  +22,10,28,7,2013-09-12,0.25,False,
  +23,21,28,7,2013-09-12,0.25,False,
  +24,10,28,7,2013-09-12,0.25,False,
  +25,10,30,7,2013-09-13,0.25,False,
  +26,10,30,7,2013-09-13,0.25,False,
  +27,10,30,7,2013-09-13,0.25,False,
  +28,10,30,6,2013-09-13,0.5,False,
  +29,10,30,6,2013-09-13,0.5,False,
  +30,10,30,6,2013-09-13,0.5,False,
  +31,10,30,8,2013-09-17,0.25,False,
   
   
   TABLE examenes
  
positive.code: TABLE inasistencias
  inasistencias.inasistenciaid,inasistencias.descripcion,inasistencias.valor
  6,Media falta,0.5
  7,tarde,0.25
  8,retiro anticipado,0.25
  9,completa,1.0
  
  
  TABLE periodos
  
negative.code: 146,2013-09-11 22:11:03,127.0.0.1,4,auth,User 4 Logged-out
  149,2013-09-11 22:53:28,127.0.0.1,1,auth,Usuario 1 sesión iniciada
  150,2013-09-11 23:41:00,127.0.0.1,1,auth,User 1 Logged-out
  151,2013-10-11 19:18:54,127.0.0.1,1,auth,Usuario 1 sesión iniciada
  
  
  TABLE auth_cas
  