[ADD] partner_relations_in_tab
[RFR] use refactoring in partner_relations
[FIX] #688, partner_relations: creating equal but non-overlapping relations was not allowed

Conflicts:
	partner_relations/model/res_partner_relation_all.py
[ENH] Module partner_relations:
    - Edit relations in pop-up form instead of through inline tree.
[ADD] translations
[IMP] put one attribute xml elements on one line
Merge remote-tracking branch 'hbrunn/7.0-partner_relations' into 7.0_therp_latest
Merge remote-tracking branch 'hbrunn/7.0-partner_relations_in_tab' into 7.0_therp_latest