Implemented shifting focus bar.
No Deletion implementation yet.
Have added display marking and boolean member in class object for flagging emails for Deletion.
The actual deletion protocol has NOT been implemented.
A 'delete' data structure is now created when the 'D' key is pressed.
'delete' contains the account names and list of corresponding uids for emails that are to be deleted.
Full deletion ability implemented.
Deletion working out of the box for Gmail's Inbox.