ENH: use clang-svn, clang-2.8 is not good enough

etc/settings.csh

@@ -117,7 +117,8 @@ case OpenFOAM:
         # using clang - not gcc
         setenv WM_CC 'clang'
         setenv WM_CXX 'clang++'
-        set clang_version=llvm-2.8
+        #set clang_version=llvm-2.8
+        set clang_version=llvm-svn
         breaksw
     default:
         echo

etc/settings.sh

@@ -136,7 +136,8 @@ OpenFOAM)
         # using clang - not gcc
         export WM_CC='clang'
         export WM_CXX='clang++'
-        clang_version=llvm-2.8
+        #clang_version=llvm-2.8
+        clang_version=llvm-svn
         ;;
     *)
         echo