ENH: simplify method names for reading argList options and arguments

- use succincter method names that more closely resemble dictionary
  and HashTable method names. This improves method name consistency
  between classes and also requires less typing effort:

    args.found(optName)        vs.  args.optionFound(optName)
    args.readIfPresent(..)     vs.  args.optionReadIfPresent(..)
    ...
    args.opt<scalar>(optName)  vs.  args.optionRead<scalar>(optName)
    args.read<scalar>(index)   vs.  args.argRead<scalar>(index)

- the older method names forms have been retained for code compatibility,
  but are now deprecated

src/OpenFOAM/db/Time/Time.C

@@ -519,9 +519,9 @@ Foam::Time::Time
     (
         *this,
         argList::validOptions.found("withFunctionObjects")
-      ? args.optionFound("withFunctionObjects")
+      ? args.found("withFunctionObjects")
       : argList::validOptions.found("noFunctionObjects")
-      ? !args.optionFound("noFunctionObjects")
+      ? !args.found("noFunctionObjects")
       : false
     )
 {
@@ -534,7 +534,7 @@ Foam::Time::Time
     setControls();
 
     // '-profiling' = force profiling, ignore controlDict entry
-    setMonitoring(args.optionFound("profiling"));
+    setMonitoring(args.found("profiling"));
 }