Employee quantity in partners

This module adds company size information to contacts. On a company contact form, in the Internal Notes tab, a new "Employee quantity" group appears (only for companies, not for individual people) where you can type the number of employees and pick an employee quantity range.

A new configuration screen lets you maintain the list of ranges (for example small, medium, large). It is reachable from the Contacts configuration menu as "Ranges by quantity of employees", and the list can be edited directly in the grid.

In the Contacts search view, a new "Employee Quantity" filter is added after the salesperson filter. It only applies to companies and groups the results by employee quantity range, so you can quickly see how many contacts fall in each size band.

The module touches the contact model res.partner by adding two fields, and creates a new model res.partner.employee_quantity_range with a translatable name. Access rights are set so everyone can read the ranges, while only partner managers can create, change or delete them. No automatic calculation, validation or email is performed by the code: the number and the range are entered manually.