Imap-tools

* BaseMailBox.fetch headers_only arg fixed

* Importing all from utils module removed from the default package imports

* Support international characters in email addresses

* Add deprecated Q to default import, *forgot =)

* Added 14 new custom lib exceptions (errors.py): MailboxCopyError, MailboxDeleteError, MailboxExpungeError, MailboxFetchError, MailboxFlagError, MailboxFolderCreateError, MailboxFolderDeleteError, MailboxFolderRenameError, MailboxFolderSelectError, MailboxFolderStatusError, MailboxFolderStatusValueError, MailboxLoginError, MailboxLogoutError, MailboxSearchError
* UnexpectedCommandStatusError now not used directly.
* Added folder.MailBoxFolderStatusOptions class instead MailBoxFolderManager.folder_status_options
* utils.MessageFlags -> message.MailMessageFlags
* query.py: ValueError replaced to TypeError in many places
* utils.short_month_names renamed to utils.SHORT_MONTH_NAMES
* utils.cleaned_uid_set - parsing optimized, raise TypeError instead ValueError, not ignore empty uid from generator
* utils.check_command_status - new logic
* BaseMailBox.fetch headers_only arg is disabled until fix

* Query builder: removed Q alias for AND
* Query builder: added new aliases: A for AND, O for OR, N for NOT