Standardized the naming of functions which control the writing of fields etc.

to have the prefix 'write' rather than 'output'

So outputTime() -> writeTime()

but 'outputTime()' is still supported for backward-compatibility.

Also removed the redundant secondary-writing functionality from Time
which has been superseded by the 'writeRegisteredObject' functionObject.

etc/templates/axisymmetricJet/system/graph

@@ -18,7 +18,7 @@ graph
 {
     type            sets;
     functionObjectLibs ("libsampling.so");
-    writeControl   outputTime;
+    writeControl   writeTime;
 
     interpolationScheme cellPointFace;