Set the default clang version to be the latest stable

etc/config/settings.csh

@@ -236,8 +236,8 @@ case ThirdParty:
         # using clang - not gcc
         setenv WM_CC 'clang'
         setenv WM_CXX 'clang++'
-        #set clang_version=llvm-2.8
-        set clang_version=llvm-svn
+        set clang_version=llvm-2.9
+        #set clang_version=llvm-svn
         breaksw
     default:
         echo

etc/config/settings.sh

@@ -253,8 +253,8 @@ OpenFOAM | ThirdParty)
         # using clang - not gcc
         export WM_CC='clang'
         export WM_CXX='clang++'
-        #clang_version=llvm-2.8
-        clang_version=llvm-svn
+        clang_version=llvm-2.9
+        #clang_version=llvm-svn
         ;;
     *)
         echo