Custom Reports - oldest, newest

- Added support for the "report.X.limit" configuration variable, to
  restrict the number of rows a report generates.
- Added support for Table::render (limit) to limit the number of rows
  that are rendered.
- Removed "oldest" and "newest" report code.
- Added "oldest" and "newest" custom report details to Config.cpp
- Updated various documentation.

src/Table.h

@@ -91,7 +91,7 @@ public:
 
            int rowCount ();
            int columnCount ();
-           const std::string render ();
+           const std::string render (int maximum = 0);
 
 private:
            std::string getCell (const int, const int);