ENH: addDictOption: consistent dict option handling

src/OpenFOAM/include/addDictOption.H

+//
+// addDictOption.H
+// ~~~~~~~~~~~~~~~~~
+
+    Foam::argList::addOption
+    (
+        "dict",
+        "file",
+        "read control dictionary from specified location"
+    );

src/OpenFOAM/include/setConstantMeshDictionaryIO.H

+//
+// setConstantMeshDictionaryIO.H
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    fileName dictPath = "";
+    if (args.optionFound("dict"))
+    {
+        dictPath = args["dict"];
+        if (isDir(dictPath))
+        {
+            dictPath = dictPath / dictName;
+        }
+    }
+
+    IOobject dictIO
+    (
+        dictName,
+        runTime.constant(),
+        mesh,
+        IOobject::MUST_READ_IF_MODIFIED,
+        IOobject::NO_WRITE
+    );
+
+    if (dictPath.size())
+    {
+        dictIO = IOobject
+        (
+            dictPath,
+            mesh,
+            IOobject::MUST_READ_IF_MODIFIED,
+            IOobject::NO_WRITE
+        );
+    }

src/OpenFOAM/include/setSystemMeshDictionaryIO.H

+//
+// setSystemMeshDictionaryIO.H
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    fileName dictPath = "";
+    if (args.optionFound("dict"))
+    {
+        dictPath = args["dict"];
+        if (isDir(dictPath))
+        {
+            dictPath = dictPath / dictName;
+        }
+    }
+
+    IOobject dictIO
+    (
+        dictName,
+        runTime.system(),
+        mesh,
+        IOobject::MUST_READ_IF_MODIFIED,
+        IOobject::NO_WRITE
+    );
+
+    if (dictPath.size())
+    {
+        dictIO = IOobject
+        (
+            dictPath,
+            mesh,
+            IOobject::MUST_READ_IF_MODIFIED,
+            IOobject::NO_WRITE
+        );
+    }

src/OpenFOAM/include/setSystemRunTimeDictionaryIO.H

+//
+// setSystemRunTimeDictionaryIO.H
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    fileName dictPath = "";
+    if (args.optionFound("dict"))
+    {
+        dictPath = args["dict"];
+        if (isDir(dictPath))
+        {
+            dictPath = dictPath / dictName;
+        }
+    }
+
+    IOobject dictIO
+    (
+        dictName,
+        runTime.system(),
+        runTime,
+        IOobject::MUST_READ_IF_MODIFIED,
+        IOobject::NO_WRITE
+    );
+
+    if (dictPath.size())
+    {
+        dictIO = IOobject
+        (
+            dictPath,
+            runTime,
+            IOobject::MUST_READ_IF_MODIFIED,
+            IOobject::NO_WRITE
+        );
+    }