improves _appraisal_count method and remove now useless one2many field appraisal_ids bzr revid: ged@openerp.com-20140507090328-wyl9gbfzdc540d1k
improves _appraisal_count method and remove now useless one2many field appraisal_ids bzr revid: ged@openerp.com-20140507090328-wyl9gbfzdc540d1k