anchor.diff:  
   TABLE notas
   notas.notaid,notas.alumnoid,notas.materiaid,notas.periodoid,notas.calificacionid,notas.nota,notas.descripcion,notas.establecimiento,notas.observaciones,notas.fecha,notas.libro,notas.folio,notas.alta,notas.web,notas.turno
  -1,<NULL>,8,<NULL>,5,2.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -2,<NULL>,9,<NULL>,5,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -3,<NULL>,4,<NULL>,5,7.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -4,<NULL>,5,<NULL>,5,8.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -5,<NULL>,6,<NULL>,5,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -6,<NULL>,7,<NULL>,5,4.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -7,<NULL>,1,<NULL>,5,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -8,<NULL>,2,<NULL>,5,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -9,<NULL>,3,<NULL>,5,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -10,<NULL>,45,<NULL>,5,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -11,<NULL>,23,<NULL>,5,10.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -12,<NULL>,22,<NULL>,5,9.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -13,<NULL>,21,<NULL>,5,8.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -14,<NULL>,20,<NULL>,5,7.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -15,<NULL>,16,<NULL>,5,3.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -16,<NULL>,17,<NULL>,5,6.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -17,<NULL>,18,<NULL>,5,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -18,<NULL>,19,<NULL>,5,6.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -19,<NULL>,34,<NULL>,5,5.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -20,<NULL>,35,<NULL>,5,6.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -21,<NULL>,31,<NULL>,5,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -22,<NULL>,32,<NULL>,5,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  -23,<NULL>,33,<NULL>,5,3.0,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,2013-06-12,False,<NULL>
  +24,10,1,19,5,6.0,,istbp,,2011-12-21,,<NULL>,2013-08-30,False,Noche
  +25,10,2,10,5,6.0,,istbp,,2011-12-19,,<NULL>,2013-08-30,False,Noche
  +26,10,3,10,5,8.0,,istbp,,2011-12-16,,<NULL>,2013-08-30,False,Noche
  +27,10,4,10,5,9.0,,istbp,,2011-12-23,,<NULL>,2013-08-30,False,Noche
  +28,10,5,10,5,8.0,,istbp,,2011-12-19,,<NULL>,2013-08-30,False,Noche
  +29,10,6,10,5,7.0,,istbp,,2011-12-22,,<NULL>,2013-08-30,False,Noche
  +30,10,7,10,5,7.0,,istbp,,2011-12-21,,<NULL>,2013-08-30,False,Noche
  +31,10,8,10,5,8.0,,istbp,,2011-12-20,,<NULL>,2013-08-30,False,Noche
  +32,10,9,10,5,8.0,,istbp,,2011-12-27,,<NULL>,2013-08-30,False,Noche
  +33,21,1,10,5,7.0,,istbp,,2011-12-21,,<NULL>,2013-08-30,False,Noche
  +34,21,2,10,5,7.0,,istbp,,2011-12-20,,<NULL>,2013-08-30,False,Noche
  +35,21,3,10,5,8.0,,istbp,,2011-12-23,,<NULL>,2013-08-30,False,Noche
  +36,22,1,10,5,7.0,,istbp,,2011-12-21,,<NULL>,2013-08-30,False,Noche
  +37,22,2,10,5,8.0,,,,2011-12-20,,<NULL>,2013-08-30,False,Noche
  +38,22,3,10,5,9.0,,istbp,,2011-12-23,,<NULL>,2013-08-30,False,Noche
   
   
   TABLE titulos
  
positive.code: 6,2° Cuatrimestre 2010,1,1,10,2010,0,<NULL>,2,0,5,<NULL>,<NULL>,<NULL>,0,0,6014,<NULL>
  8,Exámenes Marzo 2010,1,<NULL>,0,0,0,<NULL>,0,0,0,<NULL>,<NULL>,<NULL>,0,0,6012,<NULL>
  9,Exámenes Agosto 2010,1,<NULL>,0,0,0,<NULL>,0,0,0,<NULL>,<NULL>,<NULL>,0,0,6013,<NULL>
  10,Exámenes Dic/2010,1,<NULL>,0,0,0,<NULL>,0,0,0,<NULL>,<NULL>,<NULL>,0,0,6014,<NULL>
  11,Examenes Marzo/2011,1,<NULL>,0,0,0,<NULL>,0,0,0,<NULL>,<NULL>,<NULL>,0,0,6015,<NULL>
  12,Examenes Agosto 2011,1,<NULL>,0,0,0,<NULL>,0,0,0,<NULL>,<NULL>,<NULL>,0,0,6016,<NULL>
  14,1º Cuatrimestre 2011,1,2,0,0,0,<NULL>,1,0,0,<NULL>,<NULL>,<NULL>,0,0,6016,<NULL>
  
negative.code: 56,2013-08-28 19:23:29,127.0.0.1,5,auth,User 5 Logged-out
  57,2013-08-28 19:24:43,127.0.0.1,1,auth,Usuario 1 sesión iniciada
  58,2013-08-28 19:30:37,127.0.0.1,1,auth,User 1 Logged-out
  59,2013-08-29 18:46:12,127.0.0.1,1,auth,Usuario 1 sesión iniciada
  60,2013-08-29 18:46:33,127.0.0.1,1,auth,User 1 Logged-out
  61,2013-08-30 16:29:30,127.0.0.1,1,auth,Usuario 1 sesión iniciada
  62,2013-08-30 16:50:47,127.0.0.1,1,auth,User 1 Logged-out
  63,2013-08-30 17:02:08,127.0.0.1,1,auth,Usuario 1 sesión iniciada
  64,2013-08-30 17:02:40,127.0.0.1,1,auth,User 1 Logged-out
  65,2013-08-30 17:03:03,127.0.0.1,4,auth,Usuario 4 sesión iniciada
  66,2013-08-30 17:03:52,127.0.0.1,4,auth,User 4 Logged-out
  67,2013-08-30 17:04:19,127.0.0.1,5,auth,Usuario 5 sesión iniciada
  68,2013-08-30 17:04:31,127.0.0.1,5,auth,User 5 Logged-out
  69,2013-08-30 17:07:55,127.0.0.1,1,auth,Usuario 1 sesión iniciada
  70,2013-08-30 17:08:03,127.0.0.1,1,auth,User 1 Logged-out
  
  
  TABLE auth_cas
  