* 'create_tables.pgsql'
- Renamed table maildir to maillocation
- Added transport id (tid) to table domains, for default transport
* 'VirtualMailManager/MailLocation.py'
* 'VirtualMailManager/Transport.py'
- Added to repository
* 'VirtualMailManager/constants/ERROR.py'
- Added error codes for MailLocation and Transport classes
* 'VirtualMailManager/Exceptions.py'
- Added exception classes for MailLocation and Transport