Added module to cross validate the data we have with official data.
Improved docs of how we import categories.
Iminstallation instructions.
Fixed broken links and simplified english.
Added missing requirement of Python 3 to docs.
Added a common settings for scheduling operations.
Made settings of scripts consistent on apps.
Added a doc file with the organization of the code.
Improved text of usage.
Fixed wrong path to settings.
Added method to compute missing contracts in database.