Feature #415

- Added feature #415, which supports displaying just a single page of tasks,
  by specifying either 'limit:page' to a command, or 'report.xxx.limit:page'
  in a report specification (thanks to T. Charles Yun).
- Modified the 'next' report to only display a page, by default.

src/Att.cpp

@@ -344,8 +344,8 @@ bool Att::validNameValue (
 
   else if (name == "limit")
   {
-    if (value == "" || !digitsOnly (value))
-      throw std::string ("The '") + name + "' attribute must be an integer.";
+    if (value == "" || (value != "page" && !digitsOnly (value)))
+      throw std::string ("The '") + name + "' attribute must be an integer, or the value 'page'.";
   }
 
   else if (name == "status")