ENH: improve controls for Time (issue #910)

- relocate some standard functionality to TimePaths to allow a lighter
  means of managing time directories without using the entire Time
  mechanism.

- optional enableLibs for Time construction (default is on)
  and a corresponding argList::noLibs() and "-no-libs" option

STYLE:

- mark Time::outputTime() as deprecated MAY-2016

- use pre-increment for runTime, although there is no difference in
  behaviour or performance.

applications/utilities/postProcessing/miscellaneous/engineCompRatio/engineCompRatio.C

@@ -65,7 +65,7 @@ int main(int argc, char *argv[])
     {
         scalar t0 = runTime.userTimeToTime(ca0 - runTime.theta());
         runTime.setDeltaT(t0);
-        runTime++;
+        ++runTime;
         Info<< "CA = " << runTime.theta() << endl;
         mesh.move();
     }
@@ -76,7 +76,7 @@ int main(int argc, char *argv[])
     {
         scalar t1 = runTime.userTimeToTime(ca1 - runTime.theta());
         runTime.setDeltaT(t1);
-        runTime++;
+        ++runTime;
         Info<< "CA = " << runTime.theta() << endl;
         mesh.move();
     }