GUI: eliminar alumno.
Merge branch 'master' into dev-GUI
GUI: MainFrame cambios.
Merge branch 'dev-GUI'
Merge branch 'dev-Core'
Core: ListaEnlazada cambio minimo.
Merge branch 'dev-Core'
Infocleta: versón 1.1-3
Core: nuevo lookAndFeel Seaglass.
Merge branch 'master' into dev-Core