fix #684

 Prevent multiple damages replace selectionpart with another.

also try to prevent handledamage bug 
sometime dont handle leg_l & hand_l so this script dont change this damagepart by new value.

but its handle legs & r_femur_hit.

>"[B Alpha 1-1:1 (Havena),"leg_r",0.274431,B Alpha 1-1:1 (Havena),""]"
>"[B Alpha 1-1:1 (Havena),"legs",0.294639,B Alpha 1-1:1 (Havena),""]"
>"[B Alpha 1-1:1 (Havena),"hand_r",0.862463,B Alpha 1-1:1 (Havena),""]"
>"[B Alpha 1-1:1 (Havena),"r_femur_hit",0.862463,B Alpha 1-1:1 (Havena),""]"

but its dont work nice with
>// if(_selectionName == "r_femur_hit") then {_selectionName = "hand_l";};
>// if(_selectionName == "legs") then {_selectionName = "leg_l";};

part work nice with this fix but hitpart mess.
Must change hitpart config for all man class
config CAManBAse HitPoints from AGM_medical is override for some Classname  ex: B_soldier_AAR_F