Initialize v18 branch

Rename *_usability modules to *_usability_akretion

base_usability_akretion/readme/CONTRIBUTORS.rst

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+* Alexis de Lattre <alexis.delattre@akretion.com>
+* Raphaël Valyi <rvalyi@akretion.com>
+* David Beal <david.beal@akretion.com>

base_usability_akretion/readme/DESCRIPTION.rst

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+This module adds the following functions:
+
+* Adds *track_visibility='onchange'* on all the important fields of the Partner object
+* By default, Odoo doesn't display the title field on all the partner form views. This module fixes it (it replaces the module base_title_on_partner)
+* Adds a log message at INFO level when sending an email via SMTP
+* Displays the local modules with installable filter
+* A group by "State" is added to module search view
+* Provides a _display_report_header method on the res.company object and _display_full_address on res.partner which are useful for reporting.
+* Add model in cron tree view
+* Add prefix field in sequence search view
+* Better search and form view for country and state
+* Display technical name of modules in kanban view
+* Change module filter to `installable`
+* Add widget=handle on sequence of res.partner.bank 
+* Add city and country in partner tree view
+* Add widget="email" on email of contacts
+* Add script to fix partners related to users in multi-company setup
+* Add methods for py3o reports
+* Add name_get() on ir.model
+* Language wizard defaults to ".po"
+* Add tracking on partner fields
+* Handle lang in name_title field
+* Remove empty lines in address
+* Add bank Name field on res.partner.bank
+* Partners auto-created for users are Suppliers and not Customers
+* Add write_date on ir.config_parameter