[IMP] point_of_sale: distinguish discounted lines

After closing a POS session, the pos order lines are grouped by product.
Instead, distinguish products with a different discount notice to have different lines for such products in the generated account.move for better traceability.
[FIX] fix a crash with create popup forms (web client)

it was trying to call the forme 'hide' method on the searchview.  To
solve the problem, I readded the method (and renamed it to do_hide for
consistency with views)
[IMP] crm: business model cleaning

Models renamings:
- crm.case.stage becomes crm.stage
- crm.case.section becomes crm.team

Model split:
crm.case.categ has been splitted into:
- crm.phonecall.tag
- crm.lead tag
- crm.claim.tag
- crm.helpdesk.tag

Models removal:
- crm.payment.mode
- crm.segmentation
- report.crm.case

Removal of the crm_profiling module

(all these refactorings have been done in order to ease new API
migrations)
[IMP]model: Improved read_group method to display empty column result and folded columns from related model and default_group_by field will be automatically added to the kanban no need to declare in kanban to enable the button 'Add a new column'. pass options in the read_group, In options pass 'fold_field' and 'display_empty_column' fields and remove _group_by_full methods from crm, hr_recruitment, project, project_issue, survey, website_event_track, website_forum_doc modules.
[IMP]create Read_group method for many2one but issue with maintain domain

[IMP]pass option in read_group

[IMP]fix the Domain Issue

[IMP]condition for fold field as default group_by

[IMP]improved condition for fold field

[IMP]remove unused diff

[IMP]fix typo