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

tutorials/mesh/refineMesh/refineFieldDirs/calcRadiusField/calcRadiusField.C

@@ -62,7 +62,7 @@ int main(int argc, char *argv[])
     #include "createTime.H"
 
     instantList timeDirs = timeSelector::select0(runTime, args);
-    const bool calcDirections = args.optionFound("calcDirections");
+    const bool calcDirections = args.found("calcDirections");
 
     #include "createNamedMesh.H"