Report:New(): public: return self
  Object is filled with default values. The following predcessor variables
  are modified:

  Report:InfoBlock: public: code_block: override
    The code block for writing the processed record number of selected
    database to the bottom window  border is stored here.

  Report:DoneBlock: public: code_block: override
    If the user inerrupts the report creation, the output file and the
    temporary index file must be closed and deleted.