* Added an automatic donation feature when a new block is found. The -donationpercentage allows a percentage of the block reward to be donated to an address. E.g. passing the command-line parameter -donationpercentage=1.5 will donate 1.5% of every block to the developer. Alternatively, this value can be set in primecoin.conf. Also, the default address can be changed using -donationaddress.