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.

src/combustionModels/diffusionMulticomponent/diffusionMulticomponent.C

@@ -315,7 +315,7 @@ diffusionMulticomponent<ReactionThermo, ThermoType>::correct()
 
             Rijk.relax(alpha_);
 
-            if (this->mesh_.time().outputTime() && debug)
+            if (debug && this->mesh_.time().writeTime())
             {
                 Rijk.write();
                 ft.write();