Add 2.4 docs

Author: tvdijen

mk_docs.py

@@ -254,7 +254,7 @@ def getListOfFiles(dirName):
 # for which versions should we generate documentation?
 # - "devel" corresponds to git master
 # - an alias "stable" will point to the first item in the list
-ssp_versions=["2.3", "2.2", "devel"]
+ssp_versions=["2.4", "2.3", "2.2", "devel"]
 
 # Make sure we have a working site subdir to put stuff in
 os.system('mkdir ' +  site_root_dir)