fix endless loop in SimpleXMLRPCServer upon malformed POST request
Resolves: CVE-2012-0845
send encoding in SimpleHTTPServer.list_directory to protect IE7 against
potential XSS attacks
Resolves: CVE-2011-4940
oCERT-2011-003: add -R command-line option and PYTHONHASHSEED environment
variable, to provide an opt-in way to protect against denial of service
attacks due to hash collisions within the dict and set types
Resolves: CVE-2012-1150