Add the first IpfreExtractor code
Externalize path to download data and refactor some code
Begin generic xslx parser
Parse both xls files and turn their data in memory objects
Convert excell info in landportal model objects
Communicate with model2xml module and fix some bugs while building model objects
Comunicate with CountryReconciler. Generate sleces by date
Stop using dataset name
Adapt importer to let the ids be generated within the entities
Update configuration.ini

Correct the source name
Adapt frequency specification in dataset
Merge branch 'develop-importerIPFRI' of github.com:weso/landportal-importers into develop-importerIPFRI
Adapt frequency specification in Dataset
Adapt to current model
Adapt generation of indicator and user objects
Add support to tendency in indicators
Test commit
Data ecternalized and descriptions added
Fix id asignation, topic asignation and new MUnits
Fix historical mode