params update

- MainNetParams's genesis hash from zetacoin satoshi client source
- TestNet2Params (unused) and TestNet3Params
changed expected addresses from address <-> key conversion unit test (AddrsesTest)
minor changes to some tests

- BitcoinSerializerTest (port number)
- BlockChainTest (TODO for finding out exact time of Block 200000)
- SeedPeersTest (array length check for seed peers in case list is empty)