objectRegistry fixes

- objectRegistry gets a rename() that also adjusts the dbDir
- cloud reworked to use static variables subInstance and defaultName.
  This avoids writing "lagrangian" everywhere

string fixes
- avoid masking of std::string::replace in string.H
- avoid old strstream in PV3FoamReader

applications/utilities/parallelProcessing/reconstructPar/reconstructLagrangian.H

@@ -36,6 +36,7 @@ SourceFiles
 #ifndef reconstructLagrangian_H
 #define reconstructLagrangian_H
 
+#include "cloud.H"
 #include "polyMesh.H"
 #include "IOobjectList.H"
 #include "fvMesh.H"