ENH: extend flexibility of abort function object (#1119)

- Now also responds to the contents of the trigger file,
  processing action= contents similar to used with external coupling.

  Previously it only handled an action that was defined in the
  dictionary. With this update, the user can chose a diferent action
  simply by echoing the appropriate action string into the trigger
  file.

tutorials/compressible/rhoSimpleFoam/squareBendLiq/system/abort

@@ -0,0 +1,17 @@
+// OpenFOAM dictionary -*- C++ -*-
+
+abort
+{
+    type    abort;
+    libs    ("libutilityFunctionObjects.so");
+
+    file    "<case>/ABORT";   // Instead of default name
+
+    // action  writeNow;         // If we want to see immediate results
+
+    // Or use default (nextWrite) and force with
+    // "action=writeNow" in the trigger file
+}
+
+
+// ************************************************************************* //

tutorials/compressible/rhoSimpleFoam/squareBendLiq/system/controlDict

@@ -47,5 +47,9 @@ graphFormat     raw;
 
 runTimeModifiable true;
 
+functions
+{
+    #include "abort"
+}
 
 // ************************************************************************* //