[FIX] helpdesk_mgmt_stock: the order of imports matters

If a model declare a One2many field it's important that the model where the field used as inverse_name is loaded first into the registry

[ADD] helpesk_mgmt_stock_grn: links GRN to tickets

[IMP] helpdesk_motive: allow selecting reasons not assigned to a team

in practice, some reasons are generic and not specific to any helpdesk team
this commit extends the field domain to also allow selecting reasons that
are not assigned to any team

[REF] helpdesk_mgmt_stock: rename function for clarity.

Add the "action" prefix to the method called by the wizard "Create Ticket" button in order to signify more clearly that this returns an action.

Merge commit 'refs/pull/894/head' of github.com:OCA/helpdesk into 16.…

…0-alc-helpdesk_mgmt

Merge commit 'refs/pull/894/head' of github.com:OCA/helpdesk into 16.…

…0-alc-helpdesk_mgmt

[IMP] helpdesk_mgmt: make partner fields computed.

- Use a compute method for 'partner_name' and 'partner_email'
- Created a migration script to get rid of useless columns

[IMP] helpdesk_motive: make motives names translatable.

[FIX] helpdesk_mgmt: fix pre-init hook skipping during update

The condition to run the pre-init hook was incorrect because when getting to it, the condition `not module_installed(cr, "helpdesk")` would return `True` even when the module was installed before the update process.

[FIX] helpdesk_mgmt: fix pre-init hook skipping during update

The condition to run the pre-init hook was incorrect because when getting to it, the condition `not module_installed(cr, "helpdesk")` would return `True` even when the module was installed before the update process.