Indec + ICL adjustment series

[PyMap]

Rent price series from Properati data starts on 2015. Both IPC/ICL base year are higher (IPC starts on 01-2017 and ICL on 07-2020)

IPC: Is read here https://github.com/PyMap/ssyt/blob/main/ssyt/visprev.py#L194-L218 and downloaded from https://www.indec.gob.ar/indec/web/Nivel4-Tema-3-5-31

To go from 2017 backward, it would be necessary to explore this source https://www.indec.gob.ar/indec/web/Institucional-Indec-InformacionDeArchivo and check how to fill missing months for 2015 (Nov/Dic) and the entire 2016. Another important item would be to check how to link (what coeffcient should be used?) both periods - from 2015 backward + from 2017 onward

ICL: Is read here https://github.com/PyMap/ssyt/blob/main/ssyt/visprev.py#L177-L187 and base period 30.6.20=1. Downloaded from http://bcra.gob.ar/PublicacionesEstadisticas/Principales_variables_datos.asp, this is a day by day index.
To go backwards, we would need to also define if it is possible to use a coefficient to link onward with backward periods. Something additional, is to only pick one day per month (values seems to be pretty similar day by day) to use it in the same way we use the IPC.