Luciano Barletta / Pruebas-RTO

- terminada la compilacion del segundo pdf
- hecho el manual de usuario
- llenado el README para programadores
- pulido de comportamientos no deseados

Now every drawable entity has a draw(pdf) function that takes in a pdf and adds a drawing to it

Div holds drawable entities, so it checks that the method exists and calls them all in its draw method

Now there's an option for adding children with absolute coordinates

the adding process is generic now

there's an utility for compiling coordinates in the Div class.