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

applications/utilities/preProcessing/createZeroDirectory/createZeroDirectory.C

@@ -236,7 +236,7 @@ int main(int argc, char *argv[])
     (
         "${WM_PROJECT_DIR}/etc/caseDicts/createZeroDirectoryTemplates"
     );
-    if (args.optionFound("templateDir"))
+    if (args.found("templateDir"))
     {
         baseDir = args["templateDir"];
     }