Some javadoc comments incorrectly written as block comments

[phelps-sg]

Throughout the code there are block comments which should be javadoc comments, e.g. in BitcoinAuxPOW:

        /*
     * Creates an empy AuxPOW object in case the feature is not used (e.g. in the main Bitcoin blockchain)
     * 
     */
    public BitcoinAuxPOW() {
        this.version=0;
        this.coinbaseTransaction=null;
        this.coinbaseBranch=null;
        this.auxBlockChainBranch=null;
        this.parentBlockHeader=null;
    }

which should be:

       /**
     * Creates an empy AuxPOW object in case the feature is not used (e.g. in the main Bitcoin blockchain)
     * 
     */
    public BitcoinAuxPOW() {
        this.version=0;
        this.coinbaseTransaction=null;
        this.coinbaseBranch=null;
        this.auxBlockChainBranch=null;
        this.parentBlockHeader=null;
    }

[jornfranke]

Please do not work on any issues before it has been agreed and discussed. Otherwise we cannot accept pull requests.