[10666][patch] ACHIEVEMENT_CRITERIA_TYPE_HIGHEST_PERSONAL_RATING

[emsy]

* What bug does the patch fix? What features does the patch add?

- renamed ACHIEVEMENT_CRITERIA_TYPE_REACH_TEAM_RATING to ACHIEVEMENT_CRITERIA_TYPE_HIGHEST_PERSONAL_RATING

- fixes achievements Just the Two of Us and its derivatives for all ratings and arena brackets as well as related statistics

- fixes statistics for highest arena team rating for all brackets

* For which repository revision was the patch created?

Mangos 10657 HEAD b573b33a48319679b8446a2c1c518afa4f4c6976

http://paste2.org/p/1062204

[VladimirMangos]

In [10666]. Thank you