Todo
    
     There are still some things to do:
     
      - 
       
        The hw_InsertDocument has to be split into
        hw_insertobject() and
        hw_putdocument().
       
      
- 
       
        The names of several functions are not fixed, yet.
       
      
- 
       
        Most functions require the current connection
        as its first parameter. This leads to a lot of typing, which
        is quite often not necessary if there is just one open
        connection. A default connection will improve this.
       
      
- 
       
        Conversion form object record into object array
        needs to handle any multiple attribute.