ENH: add -verbose support into argList

- similar to -dry-run handling, can be interrogated from argList,
  which makes it simpler to add into utilities.

- support multiple uses of -dry-run and -verbose to increase the
  level. For example, could have

    someApplication -verbose -verbose

 and inside of the application:

    if (args.verbose() > 2) ...

BUG: error with empty distributed roots specification (fixes #2196)

- previously used the size of distributed roots to transmit if the
  case was running in distributed mode, but this behaves rather poorly
  with bad input. Specifically, the following questionable setup:

      distributed true;
      roots ( /*none*/ );

  Now transmit the ParRunControl distributed() value instead,
  and also emit a gentle warning for the user:

      WARNING: running distributed but did not specify roots!

applications/utilities/postProcessing/lumped/lumpedPointZones/lumpedPointZones.C

@@ -72,24 +72,19 @@ int main(int argc, char *argv[])
         "Suppress calculation/display of point interpolators"
     );
 
-    argList::addBoolOption
+    argList::addVerboseOption
     (
-        "verbose",
         "Additional verbosity"
     );
 
     #include "addRegionOption.H"
-
     #include "setRootCase.H"
+    #include "createTime.H"
 
     const bool noInterpolate = args.found("no-interpolate");
 
-    // const bool verbose = args.found("verbose");
-
     args.readIfPresent("visual-length", lumpedPointState::visLength);
 
-    #include "createTime.H"
-
     if (args.dryRun())
     {
         // Create without a mesh