Homepage loading time

[foutoucour]

The homepage is really too slow to be loaded.

The slowness comes from the algorithm in https://github.com/cgstudiomap/cgstudiomap/blob/develop/main/local_modules/frontend/controllers/main.py

At each loading, the number of company by country is computed. It should be cached to avoid that.

To solve the slowness:

• [ ] Add a fields.one2many on res.country partners. The field is a relation with res.partners with a domain on it like [('country_id', '=', self)]
• [ ] Change the algorithm into main.py to get all the countries. Then to length the number of companies with the right industry family and active.

[foutoucour]

fixed by #98

drop the loading time from 11secs to 2.5ecs