Several minor fixes and improvements

• When an object was removed from the hit list then the message in the status bar was not changed accordingly.
• When an object was removed from the hit via "Report Hits" then the context menu should not offer "Remove" again.
• A "Hit report" windows should be closed automatically when the user hits either "Find" or "Replace".
• A "Replace" operation should clear the hit list because it might well be outdated.
• Information provided in the status bar improved.