componerPeriodos        Function to create a vector of texts with the
                        periods to consult
leerCoyuntura           Read data from the Coyuntura module.
leerDB                  Read data from the Datos Básicos module.
leerPadron              Read data from the Padron module.
leerSIECyL-package      Read Data from the SIE
rellenar                Fill empty elements of a vector.
