Minor UI changes

* Moved log from block view
* Prepend instead of append for logs

ethereal/ui/debugger.go

@@ -83,6 +83,7 @@ func (self *DebuggerWindow) Debug(valueStr, gasStr, gasPriceStr, scriptStr, data
 
 	dis := ethchain.Disassemble(script)
 	self.win.Root().Call("clearAsm")
+	self.win.Root().Call("clearLog")
 
 	for _, str := range dis {
 		self.win.Root().Call("setAsm", str)