move reconstructPar 'guts' to src/parallel/reconstruct

- in preparation for adding an optional '-reconstruct' to a few utilities
  re-use as -lreconstruct library

- move related stuff there too
      src/decompositionMethods/decompositionMethods
      -> src/parallel/decompositionMethods

- added missing namespace qualifiers

applications/utilities/parallelProcessing/decomposePar/decomposePar.C

@@ -106,7 +106,6 @@ int main(int argc, char *argv[])
         Info<< "Decomposing mesh " << regionName << nl << endl;
     }
 
-
     bool writeCellDist           = args.optionFound("cellDist");
     bool copyUniform             = args.optionFound("copyUniform");
     bool decomposeFieldsOnly     = args.optionFound("fields");