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/utilities/miscellaneous/foamHelp/helpTypes/helpBoundary/helpBoundary.C

@@ -134,7 +134,8 @@ void Foam::helpTypes::helpBoundary::execute
             IOobject::MUST_READ
         );
 
-        if (fieldHeader.headerOk())
+        // Check for any type of volField
+        if (fieldHeader.typeHeaderOk<volScalarField>(false))
         {
             if (args.optionFound("fixedValue"))
             {