ENH: clean now removes the entire release root directory.

Utilities/Release/cmake_release.sh

@@ -138,9 +138,9 @@ setup()
 #-----------------------------------------------------------------------------
 clean()
 {
-    setup || return 1
+    cd "${HOME}" &&
     echo "Cleaning up ${RELEASE_ROOT}" &&
-    rm -rf *
+    rm -rf "${RELEASE_ROOT_NAME}"
 }
 
 #-----------------------------------------------------------------------------