Enhancement - new age_compact column

- Added support for a new custom report column called "age_compact",
  which is a more compact version of "age" (thanks to T. Charles Yun).

src/util.h

@@ -53,6 +53,7 @@ for (typeof (c) *foreach_p = & (c);                                \
 bool confirm (const std::string&);
 void delay (float);
 std::string formatSeconds (time_t);
+std::string formatSecondsCompact (time_t);
 int autoComplete (const std::string&, const std::vector<std::string>&, std::vector<std::string>&);
 const std::string uuid ();
 int convertDuration (const std::string&);