Add a "Remaining" field for the list command

[IJustDev]

The print command should display a "remaining" field below the total income and expenses.

              Earnings                |               Expenses               
Name               Value    Date  ID  | Name               Value    Date  ID 
=============================================================================
Total              000.00             | Total              000.00          
Remaining          0.00

[pylipp]

You mean the difference earnings - expenses? That's a great idea! Want to start implementing it?

[IJustDev]

Sure I'll try my best.