[FIX] crm, project.task, project.issue, hr_recruitment: fixed quick create in kanban, simplified a bit the code in the various create overrides.
[FIX] mail: take into account default_ context values for auto subscribe
[MERGE] Sync with trunk
[CLEAN] Some code cleaning before merging.
[FIX] Fixed last commit.
[FIX] crm: removed self in default_ in search view, because this is not supported in 7.0
[MERGE] [FIX] Various improvements in quick create in kanban view.

- [FIX] crm: fixed crash when searching leads/opportunities on section_id then trying to create a new lead/opportunity. The crash was due to a 'default_section_id: self' in the search_view, that is not supported in 7.0.
- [FIX] crm, task, issue, hr_applicant: fixed quick create in kanban view not taking into account the stage in which it is being created.
- [FIX] mail: when tracking modified values for automatic subscription, also take into account default values coming from the context
- [FIX] issue: added default responsible