Added and verified support for 64bit labels

To compile with 64bit labels set

WM_LABEL_SIZE=64

in ~/OpenFOAM/dev/prefs.sh

source ~/.bashrc

then Allwmake in OpenFOAM-dev.

This will build into for example OpenFOAM-dev/platforms/linux64ClangDPInt64Opt

If WM_LABEL_SIZE is unset or set to 32:

WM_LABEL_SIZE=32

the build would be placed into OpenFOAM-dev/platforms/linux64ClangDPInt32Opt

Thus both 32bit and 64bit label builds can coexist without problem.

src/OpenFOAM/containers/LinkedLists/linkTypes/DLListBase/DLListBase.C

@@ -27,7 +27,6 @@ License
 
 #include "DLListBase.H"
 #include "IOstreams.H"
-#include "long.H"
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //