refactor session_key (__errorurl) to handle cases where the form is generated throuhg an ajax call: in case of an entity form, return the entity's absolute url. Also allow to force session key value

#!/bin/sh

rm -f web/test/tmpdb*
rm -f web/tali18n.py

rm -f applications/*/test/tmpdb*
rm -f applications/*/tali18n.py
rm -f applications/*/i18n/*_full.po
rm -f applications/*/data/Schema.dot