[ NEW ] email.py

Email sending function using Micrsoft exchange server
this file may be removed and copied into gui.py in the future
small fix

devide import statement into 2; uli and usbio are separately imported
[ RENAME ] email.py renamed to email_local.py

email.py renamed to email_local.py
[ CLASS ] MainForm class functioin update

added sendmail() to enable emailing function
- currently manual input is necessary
- some fix to fit the change
.
small fix

- sendmail() will not send if "Use" is not marked
- error message window appear if sendmail() fail to send
- sendmail() is disabled by default