functionObjects: Changed options 'outputControl' -> 'writeControl' and 'outputInterval' -> 'writeInterval'

for consistency with the time controls in controlDict and to avoid
unnecessary confusion.  All code and tutorials have been updated.

The old names 'outputControl' and 'outputInterval' are but supported for
backward compatibility but deprecated.

src/postProcessing/functionObjects/utilities/setTimeStep/setTimeStepFunctionObject.C

@@ -136,14 +136,14 @@ bool Foam::functionObjects::setTimeStepFunctionObject::read
 
 void Foam::functionObjects::setTimeStepFunctionObject::updateMesh
 (
-    const mapPolyMesh& mpm
+    const mapPolyMesh&
 )
 {}
 
 
 void Foam::functionObjects::setTimeStepFunctionObject::movePoints
 (
-    const polyMesh& mesh
+    const polyMesh&
 )
 {}