Morbus: Adding admin settings for equal chance to hit and combat base ratings.

This pull request allows admins to adjust a battler's chance to hit an opponent of equal rating on the fly (currently 50%) and to do the same for the base rating of both offense and defense (currently 0). This base rating is added to both a battler's offense and defense (internally and invisible to the player) and allows admins to fine tune the impact of defense and offense modifiers. The higher the baseline, the weaker the effect of stats, skills, buffs and other modifiers. 

While the default values of this pull request replicate the current state of 103 exactly, I suggest trying out a setting of 1000, which would result in effective chance to hit among players ranging from 30% to 120%, with both extremes being very hard if not impossible to reach. Also, the equal chance to hit could maybe use being set a tad higher, say to 60% instead of the default value of 50%. These numbers should be experimented with though, which is the very point of this pull request.

As a whole, this pull request allows an admin to do two things:
1) Adjust the spread in combat ability between players.
2) Adjust the target damage output of players in weapon based combat.

This can be used to address various issues, such as nigh invulnerable dodge based chars or the perceived lack of power of low agi/aim characters.