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bf9299ab5c
As described in #206 it's theoretically possible to cause overflows when either Karma is issued via `mint()` or `setReward()` because both functions don't take the supply of the other "domain" into account. This commit fixes this by performing an arithmetic operation on `super.totalSupply()`, `totalDistributorAllocation` and the newly issued `amount`. If there's an overflow, the code will cause an overflow and reverts. This ensure overflows can't happen *after* rewards have been issued. Closes #206