Add CO2 Module in T3000.

1.Add CO2(no net)  into T3000.User can click the CO2 module to enter the
CO2 User interface.All operation in CO2 device now can easyly changed
the register value through T3000.
2.Optimize some code,make them easy to understand.Change a lot of
indigestible  number ,and defined in macro.
3.Slove some place ,that may crash in runtime.
![co2](https://f.cloud.github.com/assets/3907266/861096/55602bd8-f5c6-11e2-8535-82772a35b990.jpg)