ENH: use HashTable for mapping codeStream entries

- write intermediate code to _SHA1 directories
- add Test-codeStream

applications/test/codeStream/codeStreamDict1

@@ -0,0 +1,43 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  Any                                   |
+|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      testDict;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+// #include "codeStreamDefaults"
+
+writeInterval   #codeStream
+{
+    codeInclude
+    #{
+        #include "fvCFD.H"
+    #};
+
+    codeOptions
+    #{
+        -I$(LIB_SRC)/finiteVolume/lnInclude
+    #};
+
+    code
+    #{
+        scalar start = 0;
+        scalar end = 100;
+        label nDumps = 5;
+        label interval = end - start;
+        Info<<"on-the-fly: " << ((interval)/nDumps) << endl;
+        os  << ((interval)/nDumps);
+    #};
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //