anchor.diff:  
   [[btnremove]]
   == Removing a transaction line
  -=== UI action
  +=== UI: btn_remove / btn_remove_last
   This section describes the functionality between the remove and remove_last buttons.
   Remove_last will remove the last entry from the table-model.
   Remove will remove the currently selected entry from the table-model.
  
positive.code: 
  [[btnadd]]
  == Adding a transaction line
  === UI action
  This section describes what happens, if we enter data in the input fields and
  press the 'add'-button.
  Note: this only adds the input as a transaction line to the table-model in pyqt.
  
negative.code: Currently, only removing the last entry is supported.
  ---
  
  === Code: btn_remove / btn_remove_last
  [btn_remove_last_clicked, python]
  ---
  self.ctl.remove_last(self.model_data)
  