Added getSingleIndexedParamValue() that retrieves an index into a list of values from the named query parameter, and then indexes into the supplied list of values to return the corresponding value from the list. Used to convert numeric index query parameters passed by POST to the GET redirect target, so that the GET code can display messages, etc. (without passing the message itself as a query argument and having to escape it or have silly people pass in their own...).

indexes:

# AUTOGENERATED

# This index.yaml is automatically updated whenever the dev_appserver
# detects that a new type of query is run.  If you want to manage the
# index.yaml file manually, remove the above marker line (the line
# saying "# AUTOGENERATED").  If you want to manage some indexes
# manually, move them above the marker line.  The index.yaml file is
# automatically uploaded to the admin console when you next deploy
# your application using appcfg.py.