Implement new columns in house table

[averbraeck]

Several columns have been added to the house table. These have to be implemented on the screen. Missing / changed columns are:

• insert current market price (with discounts or over/underbidding)
• remove adjusted price label
• add buy price column
• add comment column
• add house satisfaction column
• shuffle the columns according to the design (see issue #7

[averbraeck]

Comment column is not possible to add -- the comment is related to the transaction.