ENH: improve input stringency for argList options

Previously:

  - bad command-line input such as -label 1234xyz would parse as a
    label (with value 1234) and the trailing junk would be silently
    ignored. This may or may not be appropriate. If the trailing junk
    looked like this '100E' or '1000E-' (ie, forgot to type the
    exponent), the incorrectly parsed values can be quite bad:

        label  = 32684
        scalar = 6.93556e-310

Now:

  - use the updated readLabel/readScalar routines that trigger a
    FatalIOError on bad input:

        --> FOAM FATAL IO ERROR:
        Trailing content found parsing '1234xyz'

        --> FOAM FATAL IO ERROR:
        Trailing content found parsing '100E'

   This traps erroneous command-line input immediately.

applications/test/argList/Make/files

@@ -0,0 +1,3 @@
+Test-argList.C
+
+EXE = $(FOAM_USER_APPBIN)/Test-argList

applications/test/argList/Make/options

@@ -0,0 +1,2 @@
+/* EXE_INC = -I$(LIB_SRC)/cfdTools/include */
+/* EXE_LIBS = -lfiniteVolume */

applications/test/argList/Test-argList.C

@@ -0,0 +1,80 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2017 OpenCFD Ltd.
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Description
+
+\*---------------------------------------------------------------------------*/
+
+#include "argList.H"
+#include "IOstreams.H"
+#include "StringStream.H"
+
+using namespace Foam;
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+// Main program:
+
+int main(int argc, char *argv[])
+{
+    argList::noBanner();
+    argList::noParallel();
+    argList::noFunctionObjects();
+    argList::removeOption("case");
+
+    argList::addOption("label", "value", "Test parsing of label");
+    argList::addOption("scalar", "value", "Test parsing of scalar");
+
+    argList args(argc, argv);
+
+    label ival;
+    scalar sval;
+
+    Info<< nl;
+
+    Info<< "-label = " << flush;
+    if (args.optionReadIfPresent("label", ival))
+    {
+        Info<< ival << endl;
+    }
+    else
+    {
+        Info<< "not specified" << endl;
+    }
+
+    Info<< "-scalar = " << flush;
+    if (args.optionReadIfPresent("scalar", sval))
+    {
+        Info<< sval << endl;
+    }
+    else
+    {
+        Info<< "not specified" << endl;
+    }
+
+    Info<< "\nEnd\n" << endl;
+
+    return 0;
+}
+
+
+// ************************************************************************* //

applications/utilities/mesh/conversion/plot3dToFoam/plot3dToFoam.C

@@ -93,8 +93,8 @@ int main(int argc, char *argv[])
 
     const scalar scaleFactor = args.optionLookupOrDefault("scale", 1.0);
 
-    bool readBlank = !args.optionFound("noBlank");
-    bool singleBlock = args.optionFound("singleBlock");
+    const bool readBlank = !args.optionFound("noBlank");
+    const bool singleBlock = args.optionFound("singleBlock");
     scalar twoDThickness = -1;
     if (args.optionReadIfPresent("2D", twoDThickness))
     {