Add MESSAGE_START_SIZE from chainparams when loading blocks from external files.
Add MESSAGE_START_SIZE from chainparams when loading blocks from external files.

koharjidan/dogecoin,coinwarp/dogecoin,haisee/dogecoin,coinkeeper/2015-06-22_18-37_dogecoin,marklai9999/Taiwancoin,haisee/dogecoin,coinkeeper/2015-06-22_18-37_dogecoin,Domer85/dogecoin,koharjidan/dogecoin,marklai9999/Taiwancoin,haisee/dogecoin,langerhans/dogecoin,jarymoth/dogecoin,brishtiteveja/sherlockcoin,brishtiteveja/sherlockcoin,brishtiteveja/sherlockcoin,langerhans/dogecoin,jarymoth/dogecoin,coinkeeper/2015-06-22_18-37_dogecoin,marklai9999/Taiwancoin,jarymoth/dogecoin,coinkeeper/2015-06-22_18-37_dogecoin,koharjidan/dogecoin,coinwarp/dogecoin,coinwarp/dogecoin,Exceltior/dogecoin,Exceltior/dogecoin,langerhans/dogecoin,koharjidan/dogecoin,Exceltior/dogecoin,Domer85/dogecoin,langerhans/dogecoin,langerhans/dogecoin,haisee/dogecoin,langerhans/dogecoin,Domer85/dogecoin,marklai9999/Taiwancoin,koharjidan/dogecoin,Exceltior/dogecoin,koharjidan/dogecoin,coinkeeper/2015-06-22_18-37_dogecoin,jarymoth/dogecoin,coinwarp/dogecoin,jarymoth/dogecoin,brishtiteveja/sherlockcoin,brishtiteveja/sherlockcoin,Exceltior/dogecoin,Domer85/dogecoin,coinwarp/dogecoin,haisee/dogecoin