Changed testnet params and client name

Modified the testnet parameters for pchMessageStart values, it now matches our previous versions and we're no longer conflicting with mainnet activity on testnet, when running the client.  Also changed the ports to the same as historical values, also created a new MessageStart and Port for the regression testing.  

Another minor change, was going to change our 'Client Name' to 'Thomas' in honor of the coins creator, still could, if you like this choice, I do.  Then decided to stick with what allot of other coins are doing and using the coins name, so went with 'Ixcoin'.  Think we should distinguish this from Bitcoin though, as they use Satoshi, and so when users view the client details, debug logs and peerinfo responses, feel it's important we make a distinction here on what our client displays.