[IMP] Stage/State update part 2

[IMP] Stage/State update part 2

- stages: added some fields
-- closed: indicates whether this stage close the working process, for
example task ended, lead lost, applicant hired
-- bar_fold: whether to hide the state in the statusbar; this is different
from fold that is used for kanban views. Viewing a pipe or a specific
record are effectively different things and should use different fields.
-- bar_color: field to customize the stage in the statusbar (still WIP)

- impacted addons: crm, project, project_issue, hr_recruitment
- removed 'closed' addition in project_mrp as this is now in base project
module

bzr revid: tde@openerp.com-20131018132120-h0pv01q2bagtp99x