ENH: parallel runTimeModifiable - master only

etc/controlDict

@@ -872,6 +872,14 @@ InfoSwitches
 OptimisationSwitches
 {
     fileModificationSkew 10;
+
+    //- Modification checking:
+    //  - timeStamp         : use modification time on file
+    //  - inotify           : use inotify framework
+    //  - timeStampMaster   : do time stamp (and file reading) only on master. 
+    //  - inotifyMaster     : do inotify (and file reading) only on master. 
+    fileModificationChecking timeStampMaster;//inotify;timeStamp;inotifyMaster;
+
     commsType       nonBlocking; //scheduled; //blocking;
     floatTransfer   0;
     nProcsSimpleSum 0;