[ CLASS ] SMU class update

- all class functions check isUse variable
typo fix

typo fix
[ CLASS ] new import/ UI change

- import traceback module for error message
- UI change
-- "Control temp" checkbox is marked by default
-- email, 2nd DMM and Ser-I2C unmarked and hidden by default
-- related functions added
--- dmm2_toggled()
--- serial_toggled()
--- email_toggled()