add title to Entry (or other class)

[epogrebnyak]

e1 = Entry(dr="cash", cr="equity", amount=1000)  # pay in shareholder equity
e2 = Entry(dr="goods", cr="cash", amount=250)    # acquire goods worth 250
e3 = Entry(cr="goods", dr="cogs", amount=200)    # sell goods worth 200
e4 = Entry(cr="sales", dr="cash", amount=400)    # for 400 in cash
e5 = Entry(cr="cash", dr="sga", amount=50)       # administrative expenses