Enhancement - statistics

- Added total data file size to statistics report.
- Implemented util.cpp/formatBytes.

src/util.cpp

@@ -147,6 +147,20 @@ std::string formatSecondsCompact (time_t delta)
   return std::string (formatted);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// Convert a quantity in seconds to a more readable format.
+std::string formatBytes (size_t bytes)
+{
+  char formatted[24];
+
+       if (bytes > 1000000000) sprintf (formatted, "%.1f GiB", (bytes / 1000000000.0));
+  else if (bytes >    1000000) sprintf (formatted, "%.1f MiB", (bytes /    1000000.0));
+  else if (bytes >       1000) sprintf (formatted, "%.1f KiB", (bytes /       1000.0));
+  else                         sprintf (formatted, "%d B", (int)bytes                );
+
+  return commify (formatted);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 int autoComplete (
   const std::string& partial,