Merge pull request #3 from temcocontrols/master

update
Merge pull request #4 from temcocontrols/master

Update Github from Temco to Fance
Update CO2

1.Add function for user to clear the calibration offset.
2.Delete some code that may couse the t3000 product tree view show not
correctly.
Merge pull request #73 from Fance/master

Update CO2