ENH: Added new ceeateZeroDirectory utility

Uses a system/caseProperties file to select templates from
etc/caseDicts/createZeroDirectoryTemplates to enable high-level setup
of a case.
See
- etc/caseDicts/createZeroDirectoryTemplates
- tutorials/preProcessing/createZeroDirectory

tutorials/preProcessing/createZeroDirectory/snappyMultiRegionHeater/system/controlDict

@@ -0,0 +1,54 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  2.2.2                                 |
+|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    location    "system";
+    object      controlDict;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+application     chtMultiRegionFoam;
+
+startFrom       latestTime;
+
+startTime       0.001;
+
+stopAt          writeNow;   //endTime;
+
+endTime         75;
+
+deltaT          0.001;
+
+writeControl    adjustableRunTime;
+
+writeInterval   15;
+
+purgeWrite      0;
+
+writeFormat     ascii;
+
+writePrecision  7;
+
+writeCompression off;
+
+timeFormat      general;
+
+timePrecision   6;
+
+runTimeModifiable true;
+
+maxCo           0.3;
+
+maxDi           10.0;
+
+adjustTimeStep  yes;
+
+// ************************************************************************* //