Network Hashrate, standard data directories, changed binary names.

I made a few changes to the source which do not affect the core functionality of the client.  Added a method to properly calculate current network hashrate.  The default data directory is now "DarkBlackCoin" in the standard location used by most coins based on operation system used.  The compiled binary is now named "DogeBlackCoin" and the default config file is named "DogeBlackCoin.conf".  Only linux daemon tested but the other operating systems should work as well.