ENH: glboal file handling: initial commit

Moved file path handling to regIOobject and made it type specific so
now every object can have its own rules. Examples:
- faceZones are now processor local (and don't search up anymore)
- timeStampMaster is now no longer hardcoded inside IOdictionary
  (e.g. uniformDimensionedFields support it as well)
- the distributedTriSurfaceMesh is properly processor-local; no need
  for fileModificationChecking manipulation.

applications/solvers/electromagnetics/mhdFoam/createPhiB.H

@@ -9,7 +9,7 @@
 
     surfaceScalarField* phiBPtr;
 
-    if (phiBHeader.headerOk())
+    if (phiBHeader.typeHeaderOk<surfaceScalarField>(true))
     {
         Info<< "Reading field phiB\n" << endl;