closes odoo/odoo#35754

Signed-off-by: Damien Bouvy (dbo) <dbo@odoo.com>

Since previous commit moved decimal_precision module's feature into base,
use the new syntax for fields declaration
Remove the imports to the removed module
Remove the module from dependency in manifest

sed -i "s|digits=dp.get_precision('\([A-Z a-z]*\)')|digits='\1'|" **.py
sed -i "/from odoo.tools import decimal_precision as dp/d" **py

This reverts commit 99f497b390e680629dce3a7e2e282ada74ee9884.

The reified view on the res users will be dropped in the following commit.

The previous commit adds support to define each group as a computed field on the res users.

This commit defines:
- A boolean field for each 'isolated' res.group, i.e. a group in the hidden category.
- A selection field for each 'Application' res.group, i.e. a group in a application category.

Example:
- The group to manage pricelist in sales becomes a boolean field
- The groups project user/manager become a selection field

The content of the report module is now dispatched in
the 'base' and the 'web' modules.