Core/DBLayer: Comment out MySQL client/server version mismatch warning

MySQL version above 5.1 IS required in both client and server and there is no known issue with different versions above 5.1
Core/NPCs: Fix some equipment issues introduced with 028c72a9f2c606e8af3

Also changed equips defaults to 0 (no equipment) instead of 1.

It seems that some parts of the original commit were reverted locally, my bad.