anchor.diff:  nature of working with model-views in (py)qt.
   
   == Execute
  -=== UI: btn_execute
  +=== btn_execute
   This section will describe the most important step: processing the table-data.
   Processing will calculate missing or extra values and writes it all to the
   correct tables in the database.
   
  -=== Code: btn_execute_click
  +=== UI
  +Screenshot to be added.
  +
  +=== Code
   [source, python, numbered]
   ----
       self.ctl.write_to_database(self.model_data) # <1>
  
positive.code: 
  [[btnadd]]
  == Adding a transaction line
  === UI: btn_add
  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: ----
  None 
  ----
  
  ----
  // vim: set syntax=asciidoc:
  ----
  